Regarding LTS releases, I was reading a blog post yesterday with how KDE handles LTS releases. Obviously KDE is a much bigger ecosystem with more apps, frameworks and libraries on top of a desktop environment.
(In the "Plasma LTS" section. Nate is a prominent figure in the KDE ecosystem)
He touches points about where LTS users should report bugs (to the distro first, for distro devs to triage) and how "LTS" means different things to people. Might be an interesting read from their project's perspective.