I think of the comics as being soft canon to the shows' hard canon. A bit like Pottermore - yeah, sure JKR is inventing that stuff and says it's real but ... it's not in the books so it doesn't really count. And if she decided to write another Harry book or a marauder era book, or even a founders book - she isn't going to cross reference every inane titbit she posted onto Pottermore to make sure nothing in the new hard canon contradicts the old soft canon and that would be no big deal. Tey'd just quietly change the soft canon. But if something she wrote in her new hard canon book contradicted something from the original series ... I mean my head might explode, or I'd have to find a way to headcanon it and make it fit. The films aren't actually canon because they're only 'based' on the book and 'cursed child ' ... well, the less said the better but the fact that it wasn't written by the actual creator and is written for another medium is enough for me to disregard completely.
I feel the same way about the comics - I know Joss wrote some of them, but certainly not all of them and wasn't even involved in plenty of them. They're a completely different medium, they would be disregarded in a moment if it became convenient to do so and they apparently already directly contradict hard canon (how can somebody forget Warren is dead?) so that much cannot be canon of any variety. The only reason I consider them soft canon and not out and out published fan fiction (like those Buffy books that were written back at the time - I read one called Monster Island about Doyle's dad being a member of The Scourge. It's a properly published book but CLEARLY not canon) is because Joss has said they're canon but ... Joss forgot Warren was dead. I'm not accepting his word as a literal truth, if his grasp on the show is getting that shaky - but I'll accept it as a half baked one.
I don't read the comics, though - I'm not a comic book fan in general so the change of medium was deeply unappealing to me, and then absolutely nothing I've ever heard of them makes me want to find out more. I'm not sure I've ever heard of a Buffyverse comic book story line where my immediate reaction wasn't 'well that sounds stupid.' Had the contents of the comics been the show - I wouldn't be posting on these boards 20 years later.