Well, since you asked (and you'll probably recognize at least some of this)... I absolutely hated that Buffy agonized over *voluntarily* giving up her powers, but she was willing to take them away from other slayers with only a fig's leaf blessing from Faith. What about the consequences for Satsu and Anaheed and others? Just imagine the reverse montage of what we got in Chosen: Somewhere in the world... a slayer fights a baddie in an alley, when *whoosh* - powers gone. The demon snaps her neck. Elsewhere, a high-school-age slayer fends off a group of bullies targeting a classmate, when *whoosh* - powers gone. She's easily pushed aside as the bullies mercilessly pummel the kid.
If she really had to do it to save the world, fine, but I disliked the way it was handled and I don't think there was enough acknowledgement afterward that it was a very dangerous call. Only the "bad" slayers came to complain afterward, which was super convenient. I disliked that Faith was re-empowered separately off-page and there wasn't a moment where she and Buffy talked about what had happened.
And if the argument is that they just didn't have enough time to go into that all, then sure, but the message it sends still managed to undermine the point of the season to me. The idea, as I understood it, was that it was wrong to take a group of people's power away en masse, even if some of them do bad things or you're afraid of them. Instead, the answer is it's totally OK to take people's power away as long as you're good, and it's wrong to take people's power away if you're a megalomanic. So if a politician I otherwise approve of takes people's rights away, even temporarily, it's OK?