

I am not the technical guy, so I might explain some terminology wrong. So, I will give you a few article you can read in my answer. AerynOS tooling right now is focused on the “atomic” part, you can read about it here. The “immutable” part of the original proposition (when it is called Serpent OS) is not set in stone yet. Solus will adopt what make sense for us and right now we are very encouraged by atomic update that AerynOS tooling can already achieve.
TL;DR: Solus going immutable? No plan for it right now :)
👆 This is my advice as well. Switch all your apps to the one that is available on Linux. After you get used to it, then switch the OS. No need to do both at the same time.