Commented code (as in, working code commented out, not comments in code) eventually rots/becomes cruft that at some point in time is going to bite you (or someone else in your team, or some maintainer in the future)

Yeah, "not a good practice" (i.e. "the user is wrong" or "why would you want to do that?") is the lazy way of justifying software deficiencies.

I use emacs, so deficiencies on how vim handles anything do not mean much to me, actually.