Idk I agree overall ammy is better, but that depends on how much you factor support into a tier list.
Ammy point is actually surprisingly good with good assists. It’s not reliable for fighting a lot of the cast, but ammy wins a surprising amount of matchups. (wolverine)
I don’t think ammy second is very good personally, and I think ammy is pretty much made for anchor, but point ammy is very viable when it comes to certain matchups. A lot of characters have trouble dealing with her. Just some matchups I personally like with point ammy: haggar, doom, dante, wolverine, taskmaster, nova, jill, and pretty much any other character who gets fucked by her height or has a “linear” approach. The biggest problem with ammy second is that she loses to a lot of zoning characters once they get started, so she has to come into a lot of bullshit + you don’t get her for xf3. She is trouble for these characters if and once she gets in, but otherwise it can be quite tough. Such matchups include strange, hawkeye, dorm, etc. She is only slightly better at fighting these matchups than doom is except she doesn’t provide plasma beam to compensate. Most ammy duos are stronger with ammy assist than she is with their assists. There are few examples where it is the other way around (ammy arthur>arthur ammy, ammy/dante>dante/ammy, some others).
TL;DR Probably put her last unless you’re fighting wolverine