To the OP's point, there's no way for us to know whether or not a longer backswing will help. Depending on your tempo, it might help get your various parts "synced up" in the progression of the downswing. Only you can determine that.
However, I have a golf buddy that I can use as a demonstration. His backswing is plenty long! In fact his backswing gets longer when he actually goes to hit the ball, which is the opposite of most golfers I've looked at. He reaches way back there! His problem is that he "lays the club off" at the top of the backswing, pointing the club behind him. Once he gets it there, he's screwed! He ends up "outside in", wiping across the ball resulting in anything from a little push fade to a flat out slice!
He blames it all on not releasing his hands through the ball. I figure if he did that he'd hit a dead pull, which he does on occasion, so he may have somewhat of a point.
Oddly enough, or maybe not, he only does this with his longer clubs, Driver, 3 Wood, long hybrid. His iron game is very sharp, and I'd love to be able to pitch and chip like him!
For me, if I don't have a full backswing, my hands and arms are already ahead of the lower body on the downswing leading to "over-the-top" slice. I always make sure my shoulder is fully turned on the backswing to avoid this over-the-top swing which produces slice.
If you want to avoid over-the-top swing, you must have full backswing, one where the back of the shoulder faces the target. If you don't have that full backswing, you already have your hands/arms ahead of the lower body leading to slice.
This for me is not the simplification I'd like to see. There are other ways to streamline the rules and hitting a provisional is a marginal time cost vs. searching for the likely lost ball.
The comments about OOB making you think twice are spot on for me. Does OOB on both sides of the course effectively narrow the driving area, yes. But a better golfer would still pull driver knowing they could keep in in bounds while the poorer golfer would wisely club down where it's very tight. This is the same scenario if there were trees, gorse, or internal hazards framing a tight driving hole.
OOB is often defined to keep good relations with neighbors (trespassing, property damage from divots / broken windows) as well as safety (places where unsuspecting people may be and highways or roads e.g.). I think it has to be different and more penal for that reason. But I think folks should penalize greedy developers who don't design in sufficient buffer from the fairway in order to maximize housing plots by just not playing the course or buying into the development.
Could a better simplification might be to treat all water hazards the same as far as location for the drop so there was only one hazard boundary rule / drop procedure?