The problem that exists is that you cannot just willy nilly try out entirely different desktop envs/window managers/audio frameworks on an existing install of any other distro and be certain everything will work exactly as it was when you remove it. Especially as an only moderately knowledgeable user that won't know every single piece of config that needs to be changed back. Unless you're trying everything new out on a fresh install then there's a big risk.
NixOS gives you that just by opting in to using it, and while AI also speeds up config changes and translating your existing knowledge to a new tool you're trialing in other distros as well it really shines with NixOS where you don't even have to care what it messes up while you're trying something new. You just revert and you know that nothing that was done to configure that new thing - which likely would have broken your existing configuration on other distros - has persisted.
NixOS gives you that just by opting in to using it, and while AI also speeds up config changes and translating your existing knowledge to a new tool you're trialing in other distros as well it really shines with NixOS where you don't even have to care what it messes up while you're trying something new. You just revert and you know that nothing that was done to configure that new thing - which likely would have broken your existing configuration on other distros - has persisted.