Earlier quoted context omitted.
ASCII with the English charset is easier than charset juggling and Unicode? Less subconscious negative feeling from Latin-alphabet-users? It's a linguistic version of website moving to "flat" UI design.
ASCII with the English charset doesn't cover any Latin script based language I know of (granted, a limited set) other than English. For example it doesn't cover Italian, French, German, Spanish, Portuguese, Romanian, Czech, Vietnamese, Danish, Norwegian, Icelandic, Irish, Occitan, Croatian, etc...
Dutch, like English, is almost ASCII, though there are things like "één".