Modern desktop Linux relies on software that's being fixed and improving at a high velocity, and ironically, can be more stable than relying on a distro's fixed release cycles.
KDE Plasma, Wayland support, Pipewire, etc all have had recent fixes and improvements that you will not get to enjoy for another X months/years until Canonical pulls in those changes and freezes them for release.
Similarly, newer kernels are a must when using relatively recent hardware. Fixes and support for new hardware lands in new kernels, LTS releases might not have the best support for your newer hardware.