I will never understand why in BG3 and Solasta verticality was even made a selling point. D&D never used verticality much and most people try to avoid it because of the additional math and because it nerfs melee characters hard.
Personally I like the idea of verticality if implemented right. It adds quite a tactical layer.
Verticality in Solasta mean flying, levitation, walking on the walls, push creatures, take cover, break the lign of sight to re-hide etc etc... Everything that allow you to play with verticality in D&D.
There are many new things no TB games had done before if I'm not wrong.
In BG3 it's currently limited to push ennemies and going "higher" (walking, jumping, basic actions) to increase your %to hit.
At the moment I understand why it was a selling point in Solasta because it add something new. I don't really in BG3 but I hope they have more things in mind than "shove" and the very common in TB games "our position really matter".