LTS in general being slow to uptake new versions of software is a feature not a bug. It gives predictability at the cost of having to deal with older versions of software.
With Ubuntu at least, some upstreams publish official PPAs so that you aren't stuck on the rapidly aging versions that Canonical picks when they cut an LTS release.
Debian I found out recently has something similar now via "extrepo".
Yes I could use flatpack on ubuntu, however I feel like this is partly something Ubuntu/Debian should provide out-of-the-box