The one big reason for running OS4/AROS/MorphOS is that you can run "Amiga emulation" (Or C64 emulation) with NO Microsoft beneath it ! And slightly closer to the hardware ? And with SLIGHTLY more control over the OS than if you run WinUAE on Windows .. Linux .. well .. Its also a monolith bloatware .. ?!
These days I feel less and less comfortable with Linux as well.. Im sure theres no problem to spy on inexperienced Linux users like me if some hackergroup wanted to ..
Haiku could be interesting also :-)
Another thing the various "AmigaNG" should get involved in is to get students at tech colleges coding on it ! Like it is mentioned above, Haiku is slightly further in those areas ..