Check out VanillaOS. I think it’s pretty neat. Their webpage doesn’t really get into the benefits as much as I think they should, but a very quick summary is that it leverages distrobox and some custom package manager to allow you to seamlessly install and run packages from other distros. It’s also kind of an immutable OS (but not really). It lets you pick which types of apps you want during the install (snaps, fltapak, AppImage, etc)
I am not super in the loop about why people are so against snaps, but I don’t like the centralized nature of them, and if that’s also the general concern, then flatpak should be fine, since it’s decentralized.
I saw a couple youtube videos about VanillaOS; I could certainly find you one of them if you want to know more.
You can disable it to install stuff if you want.