They need to do no such thing.
You've come to the stunning revelation that software that's under development gets new features that would be nice to have. It's almost as if putting in new features that are nice to have is exactly what developing software means.
That doesn't mean that it's a security fix that needs to be backported, though.
If you want Eoan features, you should be using Eoan. If you want rolling release software, you should be using a rolling release distro. If you want particular new software versions to have their dependencies satisfied, you should be using a PPA.
No one here is going to say that users should be mixing-and-matching random packages from disparate releases as a matter of course. Even if you had a super-firm grasp of packaging and release policy, which doesn't seem all that likely given the hostility, the next random user that stumbles across the thread might not have.
You are, of course, perfectly welcome to break your package manager in whichever way you see fit; it's your system, after all. We won't be terribly inclined to help you to do so.
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