Its not a matter of turn based or real Time. Its a matter of presentation. BG3 combat looks awful dull.
Look at Portraits as example.
Do you know Starcraft2 a over 10 year old RTS game?
The portraits are animated. Every Portrait is a real 3D Head with Animations in a Box.
So why not in 2023 have Animated Portraits which can talk in combat, cry for help or spöot thje enemy with profane language?
The question is BG3 developed around the limitations of the engine or the engine developed to support BG3?