I am not an expert but I don’t think Snap support can be added to an immutable distro after installation, meaning there is going to be some software that simply cannot be easily installed. Snap support is basically a legacy support feature at this point but I think it’s nice to cover their bases if they are trying to make something for widespread adoption.
I like that snap support is included. You can’t easily add it to immutable distros and there is still some software out there only easily available via snaps.