Linux can run specific apps with realtime priority since 6.12. Just gotta configure your audio stack to run that way.

At the grub config, append to the end of the "kernel" line:

      preempt=full

I would think that's the kind of thing the installer would take care of for you or that the app would modify on first launch. It's not reasonable to expect DAW end users to make those kinds of changes.

I don't know if any DAWs do any modifications for you, but I know Bitwig at least pops up a warning if realtime privileges aren't detected with a documentation link.

Ah yes, I understand - yes as the other comment says, kernel supports it but most distros aren't configured that way out of the box, but it's pretty simple in most of them - on Arch you install the `realtime-privileges` package and add your user to the `realtime` group, the audio server and DAW software takes it from there.