There are plenty of reasons to get rid of Ubuntu, but this isn’t one of them.
Before Ubuntu Pro, packages in universe (and multiverse) were not receiving (security) updates at all, unless someone from the community stepped up and maintained the package. Now Canonical provides security updates for universe, for the first time since Ubuntu has been introduced, via Ubuntu Pro, which is free for up to five personal devices and paid for all other use cases.
Debian is actually not that different (anymore). If you read the release notes of Debian 12, you’ll notice that quite a few package groups are excluded from guaranteed security updates, just like packages in universe are in Ubuntu. Unlike Ubuntu, Debian doesn’t split its package repository by security support though.