Even win 3.1 did that in a mandatory way with it dropping support for Real mode, and Standard and Enhanced were available for windows 2 already. And Windows app

Even win 3.1 did that in a mandatory way with it dropping support for Real mode, and Standard and Enhanced were available for windows 2 already. And Windows applications of that era went through Windows API and Windows drivers, not DOS ones (although windows itself could fallback to DOS drivers in some cases)