The current engine works great, regardless of whether you don't like the changes. Plus the benefits of using an existing framework with expanded features. Do you understand how much work goes into making a completely new game engine? What specifically can't this one do that's so important, 'cause I don't think any of your issues have to do with the game engine.
Well, to name a few: poor camera control, horrible character control system, where we have this stupid chain instead of convenient rectangle select like in YOU KNOW BG 1-2, IWD 1-2, Planescape: Torment, Pathfinders, Solasta, Pillars of Eternity 1-2, Tyranny, etc., lack of wall-climbing, lack of flying...
The obsession with complaining about shoves is actually brain rot. If you asked someone what was important for a proper game of DnD, how far down the list would strict adherence to shove mechanics be? The verticality in this actually makes shoving useful and interesting. You might think they should be toned down, but it's more fun and engaging than shoving ever has been.
Bruh.
But why compare it to pen and paper, which is entirely different activity?
Isn't it what you were trying to do in your initial post? The second part of it?
This is by no chance a 'no you' comment - I just started to communicate withing the boundaries you've set, is all.
I was implying the whole thing. The system, the books and the existing games. I've read tons of Ed Greenwood and R. Salvatore, played most of the dnd games (even Demon Stone).
And those things have humor in them, obviously. Some. But they all are serious and what's the most important part - they all take themselves seriously. BG3, because of the Larianism, does not take itself seriously. It goofs around, being silly, kewly self-aware and "fun".