I think calling it a reboot/remake is ridiculous as it has nothing in common with the original series except that the focus is on three female witches. It basically seems like the network is trying to draw in viewers by counting on people's nostalgia for the original series but the problem with this is that they've actually alienated that particular fanbase due to not linking the new series to the old in any way.
As for whether Charmed was a 'feminist' show and whether the reboot needs to improve upon that/will do 'feminism' justice ... I think that all comes down to what feminism is these days, what people view it as and the harsh way in which Charmed is viewed in general.
What counts as 'feminist' media these days is vastly different to what counted as 'feminist' media in the 90s. Whereas 'feminist' media used to focus on whether the female leads were autonomous, had pursuits and goals outside of romance, the strength of the female characters within the show (not just physical strength although that used to count for something too), the agency of the female characters, whether it had strong female relationships and how female-focused and female-driven the show was, these days for a show to be considered 'feminist' it seems that it must tick a myriad of boxes, including having characters of colour, lgbt characters and (this is a new one) trans or non-binary characters ... none of which are particularly 'feminist' issues. Social Justice issues, sure. But not what I would class as 'feminist' issues.
Honestly, I'm kind of at the end of my rope with feminists and feminism these days. Between the perpetual victimhood and victim mentality, the rampant misandry and the disrespect shown to anyone who dares to voice any kind of concerns about feminism, it's getting tiring. Feminist standards seem impossible to reach these days and this applies to media too, which is probably why so many people look down on Charmed and label it anti-feminist and why this new reboot is trying to capitalize on the feminist/social justice craze. But let's talk about the original series for a minute.
Without using today's yardstick for feminism, let's have a look at how Charmed deals with its characters and whether it ticks the original boxes for 'feminist media'.
For starters, Charmed is incredibly female-focused. It's one of the few shows I would describe as 'female-driven' given that its four leads are all females, much of its supporting characters are female, the Halliwell line is a Matriarchy and not a single female lead is ever sidelined for a male character. Despite what people claim/think, for the first four seasons of the show the sisters are all autonomous characters who never lose their agency, are presented as fully-realised and developed characters, each with their own dreams and goals, none of which are mocked or belittled. Yes, some of the sisters desire love and romance but despite the ridiculous claims of all they ever do is talk about men/chase men or whatever was said earlier in this thread, finding love is not actually a focal point in any of the sisters' lives in the initial seasons.
Prue spends the majority of her tenure single, the only serious relationship she has is with Andy in the first season and while she talks about motherhood and romance, it's never presented as a driving force in her life and her career and work is often given strong focus, especially with her career change halfway through Season 2. Piper, easily the most romantic of the sisters, also spends most of Season 1 single, and while the love triangle between her, Dan and Leo does take focus in Season 2, it's no worse nor focused on any more than, say, Buffy's Season 2 Angelus storyline (and no one is claiming that storyline detracts from the feminism of BtVS). Phoebe is actually single for the first two seasons of the show and is often shown to focus more on her life and goals, finding herself again and going back to College. Her relationship with Cole takes up much of Seasons 3 and 4, but it's woven into the story, written as a natural progression of her personal journey and unlike certain other ships which shall remained unnamed, the show actually ends up acknowledging the detrimental effect Cole had on Phoebe, forces her to confront her own personal demons, allows her to extract herself from Cole and eventually move on.
Charmed allows for the girls to grow and develop as individual characters, always allowing them agency and power. Never do we see the girls victimized, there is not one iota of sexual violence in show (which is really amazing when you think about it, as so often female strength is defined by how much suffering she can take) and never are the girls put through trauma or pain in order to further anyone else's storyline or arc. Even the Phoebe/Cole storyline is focused on Phoebe and her role within it and Cole is not handed some half-assed redemption built on her pain.
There is also a very strong focus on female relationships on the show, especially in the first four seasons. For those first four seasons the relationship that is always front-and-center is that between the sisters. We watch them grow closer when Phoebe returns, splinter when Prue dies and re-form with the introduction of Paige. The show gives tremendous focus to this relationship in those first four seasons and it's rare to see such strong bonds and such focus on relationships between women in television, even today.
I personally find the first four seasons of Charmed to be very female-focused and 'feminist' and I think that it's a better show than a lot of people give it credit for. After Season 4 Constance M Burgess left the show and Brad Kern officially took over and this is (very tellingly) the point where the series changed and became less about the sisters and their bonds, their ambitions and their characters and became about skimpy outfits and ridiculous soap-opera plots which did, unfortunately, focus a lot on the women pursuing men and romance. But the original series was created by women for women and I think that it presents the girls in an amazing way, as fully developed characters, driven by individual goals and desires, never held back by romance but still showing a desire for it without it detracting from their arcs or characters. Is it the most cohesive, intelligent or well thought-out show? Not really. But the first four seasons are better than people give them credit for, the characters are great and the show has real heart. And yes, I believe that the first four seasons were 'empowering' and that they did their female characters right. It wasn't until a man took over the show that it all went to hell.
A reboot is superfluous and ridiculous and given that it has literally nothing to do with the original series, I wish they would name it something else and leave Charmed and the fandom in peace.