Technically your git history isn't a record of what you did, only what you committed. If I make a bunch of changes locally, commit then realise I need to make

Technically your git history isn't a record of what you did, only what you committed. If I make a bunch of changes locally, commit then realise I need to make a few extra changes before pushing there's really no harm amending the commit. But once pushed, I agree, it should stay as is.