Currently using Cachyos on my main desktop and laptop. As well as mainly working with Unreal Engine.
My biggest complaint is that UE 4.26 is not setup to use Codium as a editor; double clicking a blueprint node does not bring up the code in C++. Aside from that it works perfectly fine! I had to compile from source of course which took upwards of 1 hour for each machine to compile. This was expected and it runs fine. The projects work fine as I have not heard of any Blueprint Corruption happening between the live and my compiled version of the engine.
As for source control; my current group project uses SVN and kdesvn is not as friendly of a tool as Tortoise SVN was on windows. It is source control and it works just the same but I do find myself going to windows to do specific revision checking when searching for when a bug got introduced into code.
Finally, I still do windows development in my custom framework - it has just adjusted to the mingw_64 compiler and wine for testing. Because of this I am actually losing out on the debugging tools I know the best from windows (Remedy BG mainly but also Visual Studio).
It hasn't been the simplest transition and I did spend a whole year learning new tools to help be move away from Windows. I am glad that game development is viable as this would have been one of my biggest hurdles for switching. Phew.