Issues are:

1. Professional audio is nearly nonexistent on Linux, save for some pretty well done API. You're stuck with default drivers, and the main DAW for Linux (Ardour) interprets the "free and open-source" a little bit liberally (pre-compiled versions are paid, and there's no guides on how to build them). LMMS fortunately does not suffer from such issues, and is a pretty good free alternative for FL Studio.
2. As long as Windows will be mainstream, development needs there too. As a game developer, I prefer to primarily develop on Windows (since most gaming is done there), and I find a lot of issues with how stuff on Linux is being done. And since I found a pretty good debugger for Windows, I also started to prefer that too.
3. Linux still suffers from what I call "developer comfort of UX discomfort". Basically it stems from the devs getting comfortable with bad UX, then refuse to fix it due to a multitude of excuses, including gems like "wanting to avoid spoonfeeding the users" and "introducing users to the beauty of scripting".