Plus, I feel like without it there is no point in actually animating the dice roll - it can just be done under the hood and you either fail or pass.
Entirely disagree with this. That's what D&D is as a player: you roll the dice. The DC matters only to the DM.
As to the rest of your point: I guess? All of this can be solved by sharp writing. Which is something Larian is very good at. And something BG3 already has. So eh, my point stands. I don't need to know the DC. I can kinda infer that it's probably difficult to persuade a very articulate ogre to work for me. And if I fail with a roll of 15, I already know the DC is high. If I fail with a roll of 4, however, the DC can be low or high. And I think that would go a long way in helping players embrace their fate.
