That's true for the store (Pop Shop), but not for the CLIs (apt and flatpak).
If an app has only a .deb or flatpak version, it's not clear which will be
installed. If there are multiple versions, you get a dropdown menu to select
one. Unfortunately, some apps are listed more than once (different packagers,
I assume).
Ubuntu, on the other hand, will sneakily install snaps via apt.
Ubuntu, on the other hand, will sneakily install snaps via apt.