[rzzzt]

It is irrational, but "feat" tells me the change is a marvel, something to be looked at. Webster says "an act or product of skill". Nah, it's a feature. "feat" sounds pompous. Shout it from the rooftops: everyone, this is a feat! Not a small feat. Aah. Feat.

"chore" is too vague for me. A "feat" can be a "chore" if I don't want to work on it. "chore"-s like the one you describe are occasionally feats (the no-quote kind).

Oh well.