Ubuntu is Debian with more up-to-date packages and a lot of additional third party packages. There’s a lot of companies who produce development toolkits, frameworks, and applications that are explicitly built for the Ubuntu base. Some governmental agencies and organizations also require access to packages and repositories that have been audited by security agencies, which Ubuntu has gone through the process of getting certification for certain kernels and their Ubuntu Pro repositories. All of which are useful for real world customers.
Regardless of shortcomings in Snap, Pop does not rely on Snaps, and offers its own packaging for things that would otherwise require Snap on Ubuntu.