In RTWP you were able to move or change your actions depending in what the enemy does.
The problem in TB (among others) is that you have clusters of enemy turns where they can literally kill you and you are just watching without any reaction. Not only unrealistic, but also frustrating.
Plus in DOS2, there was always a very strong enemy that would start the fight with 4-5 actions and you would only stare without doing nothing.
That's just part of the strategy. It takes some mental prowess to control 4 party members in real time, even with pause, just like it takes mental prowess to make sure you're prepared to take on 4 turns in a row. Also in BG3 there are reactions which help.