The problem here is that for that purpose, Flatpak is better in nearly every way and is far more universal
I think Snap makes the most sense for something like Ubuntu Core, where it has the unique benefit of being able to provide lower level system components (as opposed to Flatpak which is more or less just for desktop GUI apps), but it doesn’t make sense for much else over other existing solutions
That’s not mentioned in this specific blog post, but that’s always been one of Vanilla OS’s defining features, it’s “apx” package manager to install those various types of packages
It’s even using Distrobox actually, but the point is to make it simpler to install packages for those contrainers, with the user not worrying as much about managing the individual containers, and not having to memorize the specific commands for each individual distro’s package manager
Basically, like the rest of Vanilla OS, the point isn’t that you can’t do this stuff elsewhere, it’s that it’s trying to make it easier to do it