@chaosmos please check this recent shorter discussion we had:
How to install mongodb 6.0 on Ubuntu 22.04 - Ops and Admin / Installation & Upgrades - MongoDB Developer Community Forums
“Fast release cycles” of operating systems favor the latest versions of libraries (ubuntu comes every 6 months). unfortunately, “latest” does not always mean proven to be “stable” or easy to migrate. Stability is important for server programs like MongoDB so they have to use battle-tested libraries (even if they may have bugs) hence the delay of support to newer OS versions.
The fortunate thing is older libraries can still be installed and used mostly without any problems if all their dependencies can also be installed. you just need to dive into some settings manually. that is until developers manage to migrate to new libraries, which MongoDB also did but that is not just reflected in documents yet.