A new foundation for TUXEDO OS: Switching to Debian: Many users have noticed that we have reduced our update cadence over the past few months, particularly with regard to Plasma updates. While Plasma 6.7.x is already available, TUXEDO OS is currently ...
Interesting. They are concerned about security updates delay, but then there is this: https://www.debian.org/doc/manuals/securing-debian-manual/ch10.en.html#security-support-testing
Basically, it says that testing gets security updates later than stable and unstable.