You can mess up android by installing third party apps, using shizuku, or rooting. If there is a distro as strict as vanilla android is for the average user, then you are right. I’m talking no root, no sudo, only official flatpak apps can be installed and only user’s home directory is r/w.

Even for an intermediate user, immutable might be a good choice, but it is extra unneeded complexity for a beginner, according to my experience with those type of distro in the past.

But people are different. Some might feel right at home.

Developers, yes. Beginners, I don’t think so.

My advice would be, only use vanilla/default/official versions of the most popular distros. Ubuntu, not Ubuntu Studio, Fedora, not (I don’t know what variants there are) Fedora. Do not use specialized distros, for example a gaming distro. Do not use 3rd party repos. Do not manually install any packages from anywhere. If you want something and official repos of your official distro cannot do it, just don’t do it. Do not try to find a workaround and make it happen.

After using Linux for a while you’ll become more comfortable with it and you’ll slowly start moving outside the above limitations. The best and worst thing about Linux is that your OS is yours and you can tinker with all of its parts. But you shouldn’t, at the beginning. If you were to tinker with Windows like that, it would also break.