I just thought of yet another flaw:

If this move is supposed to REDUCE save-scumming, well, I can tell you at least for me, it's going to have the OPPOSITE effect. I basically NEVER save-scum before fights, I always play them straight through from start-to-finish. The only exception is if I am testing something.

But now, with the chance of success pre-rigged in advance, It's actually making me more inclined to save at the start of every character's turn so I don't do things like waste a Ricochet which was preordained in advance to fail, putting it onto cooldown for 3 turns.

Why shouldn't I save-scum now, to let me go back and try something else just in case my tactic was destined to fail in advance?

CONGRATULATIONS, LARIAN!