I suppose I have been lucky. If I ever actually had to edit something critical on an unfriendly box, I suspect I'd still just do it in Emacs via tramp because I

I suppose I have been lucky. If I ever actually had to edit something critical on an unfriendly box, I suspect I'd still just do it in Emacs via tramp because I know I'd be less error prone. But as you suggest, for many years now I've experienced a strict divide between config changes, which are managed properly and not just done as ad-hoc edits, and boxes that are meant to be interactive, in which case the environment is tailored to the users.