As with many feature outlined, most things are still on drawing board and not yet realized. But yes, the declarative system management ala NixOS was being discussed. The focus now is making “Versioned Repository”, so user and developer can avoid breaking changes altogether.

They just released a new blogpost if you are not aware: https://aerynos.com/blog/2025/06/30/mid-year-update/ .

👆 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.

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 :)

I don’t agree with your assessment of Solus condition now. Granted I am biased as I am part of the staff. After the outage in early 2023, we have been going strong ever since. There are more contributors than ever. The bus factor problem has been mitigated by more people now have access to critical infrastructure.

Sure the old-heads are all gone but the future of Solus couldn’t be more clear than right now. eopkg was ported to python3 and now it is (finally) the default. We switch installer to calamares and in process of replacing our software center. Documentation also now looks better than ever. We already shed so many technical debts that is been going on for years, long before the outage. In the future the plan is for Solus to use AerynOS tooling and on their side development is going rapidly. You can read this all about this on our blog, devlog and forum.

I wrote the monthly “Contributor Roundup” in the forum, it summaries what the contributors been doing in the month. I would say we have pretty steady contribution rate and there is always new contributor coming in. If you have not tried Solus again after the outage, please do. You might be surprised on how things have changed and hopefully for the better. If you find anything that is not good, do not hesitate to tell us. We always appreciate a constructive feedback.

Anyway cheers!