FMOD, Unity engine, Vs code, Reaper and VSTs.
Did all these things work fine in manjaro and connected to each other smoothly working at the same time? I’m thinking of leaving Windows behind, but I didn’t have the best Ubuntu experience with these programs when I tried to get them all working together.
I have no experience in audio production, but it looks like every tool you named is avaible as an linux version, so give’em a try and probably search in the fine archwiki for optimizions.
I think you have to deep-dive into pipewire, jack, alsa and stuff.
But maybe the dedicated forums of the tools are a better place for answers…just my 2 cents…