This works fine as a personal choice, but doesn't really work if you're writing something other random people interact with. Even for just English it doesn't w

This works fine as a personal choice, but doesn't really work if you're writing something other random people interact with. Even for just English it doesn't work all that well because it lacks things like the Euro which is fairly common (certainly in Europe), there are names with diacritics (including "native" names, e.g. in Ireland it's common), there are too many loanwords with diacritics, and ASCII has a somewhat limited set of punctuation. There are some languages where this can sort of work (e.g. Indonesian can be fairly reliably written in just ASCII), although even there you will run in to some of these issue. It certainly doesn't work for English, and even less for other Latin-based European languages.