That’s an interesting idea, but if you make Arch’s root read only you’re leaving behind pacman/AUR (and to a good extent the Arch wiki) which are usually the main advantages of Arch based distros. SteamOS solves the stability issue by providing runtimes for games, I didn’t read anything there about anything similar on your distro. Correct me if I’m wrong, but it seems you’re not solving the stability issue, or in other words you will still be unstable as this will be a rolling release. In short I don’t see what would be the advantage of this over base Arch + Snapper (or timeshift). In that regard, how is this different from Bazzite? I know it will be a different kernel and package versions but in principle the philosophy seems to be exactly the same, and I don’t expect the kernel/packages to be that different either.