Bazzite is my first immutable distro. Idk that I would want this for my dev machine - but for a gaming/general desktop usage it’s pretty amazing. If they exposed more of the maintenance tooling and stuff like adding RPM layers via the UI then I think they’d have a really compelling OS for non-technical users.
I had the dilemma of choosing between Bazzite and CachyOS or Manjaro for my workstation, which is also my gaming rig.
The whole immutable distro felt like a hinder for my workflow (running docker containers, etc.), so that's why I went for CachyOS.
I agree, if you have a specific dev flow that is compatible with the immutable OS approach, then these can be wonderful dev machines, but personally I don't want to change my workflow to fit the OS, I prefer the OS to fit my workflow.
At some point I I'm pretty confident that I will switch to an immutable version of Fedora and relearn my workflow in a distro box like world as I do see some real benefits to doing so, but I'm not in a hurry