There is actually quite a bit of great audio software on Linux.
Reaper is, in my opinion, a top-end DAW.
And you may curl your lip at this, having seen you mention Ableton 😁, but Bitwig has a native implementation. (i'm a bitwig fan, but I'm sure if I had been using Ableton for years it would be a very hard switch even as similar as they are.)
But the devil is in the smaller details for this one, and I think you mentioned your Apollo. Let me know if you want to sell it. I think you have access, therefore, to some of the best DSP available and also fabulous preamps and converters. And I know Linux is Linux, but Thunderbolt is a really weird move at this point I don't know why UAD did that. But then again, again, I personally would think I could get Thunderbolt working with Linux, but I've never tried.
But it's the little stuff, the software instruments, the hardware compatibility, the plugins.
And, I have occasionally given it a shot because I am a curmudgeon who believes one should be able to make great sounding stuff without every single whizbang tool and indeed you can, but you can also build a house with a rock and wooden nails.
Finally, Linux's audio subsystems are some of the most convoluted software ever created by human beings. Alsa/pipewire can be configured to do just about anything and do it well that that configuration may kill you in the process.
I do praise pipewire. It did take Linux audio from being something designed just for tan colored computers to something that could do anything I wanted it to do, but it's just so damn complicated.
