I don’t think the snap argument is without merit, I just think it’s an argument only had by a very technical subset of users. I think your comment illustrates that.
I don’t agree that anybody would be left “orphaned” on Ubuntu. LXD vs Podman is again a very technical question for a specific subset of users.
I also don’t agree that SteamOS is the goal for compatibility and support. Compatibility is best with Ubuntu, it’s the most widely deployed and used desktop distribution by far. Most other desktop distros are a rounding error when compared to Ubuntu user-wise.
I’ve also personally had a buggy experience with SteamOS. I wouldn’t use it as a desktop in its current state, but I’m aware some folks do just that.
For someone new to Linux who just needs to get on with their desktop work, Ubuntu is the best distro there is (flawed as it may be). Mint is also a good choice for the same reasons.
The “phone-native” theoretical new user may become more of a real thing in the future too. When GNOME and Pantheon started developing in that direction I thought they were chasing ghosts, but now it turns out they may have just been a decade ahead of their time.