> I can't offer a general solution, but if password managers simply refused to autofill to any field other than the one with the matching standard autocomplete attribute, web developers might start doing the right thing.

Unlikely. The password managers would just lose users.

I've even caught myself being annoyed at 1Password when it doesn't work while the cause is obviously the website doing some stupid thing.

I wonder how 1Password works on this problem though, do they just accept the crap and keep working on their guessing magic or do they also invest in standardization?