I went back to oreo, it wasn't to bad except if anything goes wrong you have to try and figure it out because the suggestions online are out of date! Lol
I'm waiting to see how pie goes with all the updates before I touch it again.
The recent apps page is just overlay above the actual recent apps page which hasn't been updated for Android Pie (still is a vertical list from Stock Android Orea). It makes it super laggy on mid range phones which have received the update. Also, since it's not the part of the system UI and is just an overlay that's a part of One UI Home, it doesn't look as intuitive with 3rd Party Launchers. Opening recent apps looks like I just opened an app (which it is actually. The One UI Home App). Also, the gesture navigation for recent apps doesn't work if I disable the one UI Home launcher to bring back the not laggy native vertical app switcher. This is also because the gesture navigation is bound to only trigger the overlay app switcher of One UI Home. It sucks. Please change the code and make native app switcher a horizontal scrolling list instead.