You're completely missing the point of my post
Epic should work with the devs on a deeper level and make version transitions faster and effortless with each major Engine update, as well as provide necessary means so that older games with absolute dogshit performance could also benefit from this. Each new version intros not only visual upgrades, but also a lot of updates related to performance, streaming etc. etc. S.T.A.L.K.E.R. 2 for example uses outdated af UE5.1 if iirc and so it causes a lot of problems and performance issues that are no longer present in new versions of the engine.
Visual upgrades are completely different cuz of the reasons I mentioned in my previous post, unless we're talking about Hardware Lumen, GI etc. which only needs some tweaking to work instead of complete rework of environments.