This is perfectly analogous to websites checking for specific browser versions. So many websites exist where you'll browse with Chrome or Firefox and you'll ge

This is perfectly analogous to websites checking for specific browser versions. So many websites exist where you'll browse with Chrome or Firefox and you'll get a big red "Looks like you're using an old version of Internet Explorer, please upgrade to IE6 or newer" just because they're checking your user-agent header rather than availability of specific features. This is what Linus is trying to avoid in the Linux ecosystem—a noble cause.