I sold off my 5s after I made my recent lengthy rant-post about how the 5 tier is plagued with issues. I never mid-leveled mine like you, though - I went straight from “not high enough to affect scaling” to “three at level 450.” PVE scaling didn’t bother me, but PVP was just not enjoyable, and it’s the main reason I play.
PVP has become fun again - I can float much higher and use non-optimal combinations of boosted characters, and while getting much above 900 is once again nigh-impossible without many shields, that never really bothered me anyway.
PVE feels slower now - after using Thanos, even with the crazy-scaled enemies, absolutely everything feels like it takes a year, even boosted Peggy with IM40. Trivial nodes also require me to make more than 1-2 matches, which is kind of annoying. That said, I really only play PVE for progression ISO and CP, and never shoot for placement, so this doesn’t matter much.
In short, while I didn’t enjoy flushing 1.5 million ISO down the drain, it’s definitely brought back a lot of the fun for me.
The flip side is that my overall enthusiasm has dropped a bit. Knowing what’s waiting on the other side of the 5* rainbow, and knowing that it’s not all it’s cracked up to be, has taken a lot of the thrill out of opening LTs. Now, when I see that purple rectangle pop up, it’s less “SWEET” and more “oh neat this might be useful someday.”
I’m still saving my LTs from champions and Crash matches with the intent to eventually spend them on a good trio of Latests which will hopefully provide a better experience than my previous one, but I no longer feel like I need to grind out every shred of CP and pray to RNGesus for 5* covers. Also, my CP is currently going to Classics because I want to get Blade, Medusa, Rocket & Groot, and Cloak & Dagger as strong as possible before they leave tokens. Any old 5* characters I cover (and I have a couple that are close) will just be gravy for now.