Because it's not a "vast" difference.
Well, again, you're seeing a "vast" difference where there really isn't one. So that's coloring your whole way of thinking here. The course ratings aren't very different, and that's MUCH more likely to result in changes to scoring.
And, you don't get to see their notes, but you can essentially re-create them. They're just a bunch of numbers, many of which are empirical. You can measure the depth of bunkers, their proximity to greens, and stuff like that.
Which means they've probably done it correctly.
I've been Playing Golf for: 15+ Years My current handicap index or average score is: 18.3 My typical ball flight is: Mid to High The shot I hate or the "miss" I'm trying to reduce/eliminate is: Shanking my irons.
The problem with rules and laws is whether or not they can be enforced.
Imagine the scenes if people were asked to hand over their personal devices. It would cause more problems than it solved.
To me, the more worrying thing is that people are missing out on the experience of actually being there. It's not about the player, it's about the photographer. Really, who is interested in your shot of player x? Or your crappy picture of the Mona Lisa? It's just a pathetic quest for personal validation; I was there, so I must be important.... or at least, exist.