Laziness? Or time constraints and specialization? I see the last stage of compiling as a special skills which requires a lot of time, especially if you want to

Laziness? Or time constraints and specialization? I see the last stage of compiling as a special skills which requires a lot of time, especially if you want to support multiple platforms. If you're thing is to create a great programming language, then your time is better spent on that rather than create a bad or ok backend supporting very few platforms.