uhm but people using your webapp won't know/care the way you built it (tools/language/OS), so if the time is so precious to you and other than for learning new

uhm but people using your webapp won't know/care the way you built it (tools/language/OS), so if the time is so precious to you and other than for learning new things (that is always good, I don't say the contrary), why are you using linux instead of windows to develop your software?