IMO immutable distros aren’t a best fit for a desktop computer. It can do so much more than gaming and turning it into a dedicated console is a step back if a normal linux distro can do just as well.
I would personally nuance this to: “Current iterations of ‘immutable distros’ that have evolved from traditional distros haven’t matured sufficiently yet to tackle 99.99% of the use cases ‘easily’.” The exact number on the percentage I don’t know. I believe most people that use their PCs as a glorified app launcher should be more than fine. But we start experiencing major difficulties the very moment that (a)kmods are involved; some of which are ‘supported’~ish, while others certainly aren’t.
But, I simply fail to see why a future iteration would not be able to solve related issues.