If they are using Fields like the 49ers used Trey Lance, then I won't be second guessing that strategy, I'll be first guessing it. It's dumb as hell. The 49ers inexplicably decided to use Lance like Taysom Hill's QB power. You don't draft a QB in the 1st round to use them like Taysom Hill and run them straight up the gut 3-4 times a quarter right into the heart of the defense. The 49ers were hellbent on running QB power, Lance got hurt and lost a full year of development due to stupidity.
I'm cool with like 3-4 designed QB runs at most a game and the rest coming solely off broken plays. The runs where he makes something happen because the pass protection breaks down or he takes off because no one is open, those are cool.
It's the QB power game that I hate because you're letting your QB get hit by the biggest guys on the field repeatedly and often from multiple angles. I hated that strategy in college (Frank Solich used to run his QBs at Nebraska like that and I fucking hated it then too). That's a recipe for injury, regardless of player. It also adds wear and tear which can turn a small injury into becoming a big injury. So if that's the route they go with Fields then this coaching staff would absolutely be the wrong choice and should be fired asap.