Before it was a simple dice roll (with about the same 3D effect), using normal randomness and according to the rules. People used to action games complained and didn't understand why they character, normally skilled in persuasion for ex, could miss a roll and fail to persuade. Or the old "I'm always unlucky, the randomness is wrong" syndrome.
And so Larian started to add non-D&D tweaks that allowed you to change the outcome of the roll: possibility to throw again, "improved" randomness too I think. And now this even more complicated system.
I'm not keen on conversation looking like combat with improvised buffs and retries, I'd rather have just the normal dialogue with options to use skills and plain, normal rolls. Simple and according to the rules, not more Larian-ness.