For wish-fulfillment? Yes, more Faith would've been welcome, so see her reactions/interactions in 'Band Candy' or 'Lover's Walk' or even 'Gingerbread' but I guess she's supposed to be only 'kinda close' to the Scoobies until 'Revelations' and then distinctly apart from the rest of the group with the exception of Buffy after 'Amends'.
Faith's supposed to drift away, apart from the group, taken for granted and forgotten because, honestly, the CORE group of friends are all dealing with their own high school romantic dramas and Buffy has Angel's return/getting back into school to deal with. They don't really have time for the newbie. 'Great, superpowered slayer but she doesn't really 'go here' and so doesn't really 'get stuff'. But she sure is handy to have around for patrolling or guard duty or whatever.'
That's actually very true to real life when it comes to a close-knit group of friends who have been through a lot of intense emotional stuff together; they bonded better.
Besides, it can be impactful regarding what we don't see as well as what we see. I'll give an example; in 'The Zeppo' was saw a really intense B-plot saving tha world scenario with out 'principal heroes' (Buffy, Giles, Willow, Angel & Faith) fighting in what seems to be a rather epic battle on the Hellmouth. And from what we can gather it was a close run thing. We don't see most of it- because of the main Xander plot- but we see the aftermath; the 'post-game' at school the next day.
And with the exception of Angel (because daytime) the glaring absence of Faith is obvious; she just isn't there for some reason. Oz is, Xander pops by, even Cordy watches from a distance, but Faith hasn't been invited along to bask in the world-save-age. You would've thought the morning after a big, epic-battle event would be the perfect time for some group bonding. But Faith doesn't really 'go' there, so...
Note, that I'm not making excuses for her heel turn, but for it to feel like a sudden and shocking (but still believable) the writers had to tread a fine line between friend and outsider. Faith was an ally who had a connection/insight with Buffy (and eventually Angel) but she was always kind of apart from the rest. That wasn't her life, this wasn't 'her' town and so she picked her own path...off the edge of a cliff lol.