I don't see this scoring system as a measure of driving, it's more of a measure of how well their FSD system can interpret the places you drive and how well it will be able to handle it.
Safety score aside. One day last month I tried using the auto steer w/ lane changing on a 4 lane city street, I was coming up to my right turn and there was an extremely long right turn lane, like 700+ feet. There was a bike lane between my lane and the right turn lane, with dashed lines for the bike lane indicating that it was safe to cross the bike lane. I checked to make sure it was clear, and I turned on my turn signal to have it change lanes into the turn lane. It decided to lane change into the bike lane and straddle it... LOL.
Then there's the stupidity of the LKA/autosteer, where the right lane marker disappears because of an off ramp, so it jumps the car a foot or two to the right, only to jump it a foot or two back to the left when the road stripe on the right comes back. If you hold the wheel to actually keep the car in lane, and prevent the unsafe adjustment it's making, it disengages.
For their safety scores. This morning i had a FCW for a car that was so far ahead of me that it initially wasn't visible in the computer model of the cars around me on the dash. I regen braked all the way up to the car, only using the brakes for the last few feet to come to a complete stop. I've also had FCW's a few times for cars that took a right turn and was completely out of my lane when i took my foot off the brake and started accelerating, the computer was just too slow behind the real world to realize the car was gone and there nothing there to collide with. I haven't once had a valid FCW, so their metric there is more of a measure of whether or not their recognition misinterprets what it's seeing in the place i live, with lots of bright sunlight and reflections.
I selected to trial the beta because i'm _hoping_ that it fixes the outright defects in the existing system.
But, taking my kids to school it dings me for fast turns and hard braking, when i'm just pacing all of the traffic around me, blending in. Apparently everyone on the road is supposed to drive like they're driving miss daisy. In Florida, if you drive like that you'll have people running you off the road, many drivers here are crazy and impatient. It's safest to blend in and pace, and just keep out of the way of the crazies. Don't be a crazy, but don't impede the crazies either.
To me, when their computer system can properly interpret a normal and uneventful school drop off in the morning, pacing and blending into traffic around me and score it as 100, that'll signal that it might be ready for beta in my area.
So far, the only accurate piece of their measurement seems to be the safe/unsafe following distance.