You're right, the players shouldn't be (and aren't) asked to bring a scale.
I disagree about taking away the ability to dispute discs. It would be easy to hide an illegal disc from a TD, but would you really want to have no recourse if one of your card mates pulled out an Aerobie Pro Ring and fired off a 1,333 foot drive off the tee?
Honestly it's already beyond easy to hide an illegal disc, how are you going to know I shaved a couple thousandths of an inch off my leading edge without a profile gauge for that specific wing, I think the process should be at an event bigger than a x tier:
1. Check in.
2. Tech inspection: wing profile gauge and weight.
3. Meeting to comprehensively go over course specifics.
Obviously for tee time starts this silly idea of mine falls apart but I'm also a shotgun start advocate but that's another rant.
Adding to the anecdotal expierences, in the early 2000s, I played at the Melbourne open in Florida and one dude in intermediate on my card was friggin smoking the whole field off the tee on the tight turning holes with one of those "the wheel" discs. I thought it was the coolest thing to see and it definitely pissed off some of the advanced baggers. I would personally like to see goofball discs like that legal again it was fun to see in action.
If someone could blast an aerobi ring 4 digits off the tee I would cheer them on that's fair game in my mind. 99% of people who play disc golf couldn't put one past 500 accurately and if they could if they hit anything besides soft tall grass the tune is out and that thing is basically scrap until it's meticulously re tuned in the field.
I look at it like this. If we have approved wing profiles and max weights, then they shouldn't ever leave the factory out of spec, that would nearly eliminate all the shenanigans with super special runs that aren't at all what the original design was and all of the stupidly overweight discs.
Ideally, there should be two disc categories:
1. public legal, capable of surviving a lawsuit if a pedestrian is hit with it on a public course.
2. Competition legal, passes tournament tech inspection but allows all the current rule skirting discs that are already in play, or not at all, leave it to the TD to set the stage for what kind of liability they want or not depending on the course.
As it is, there's already a belligerent amount of discs outside the approved design in play in events all over the world from casual league play all the way up to big boy high dollar tournaments and I think that something needs to give and it shouldn't be up to the players to argue it out as to what is or isn't, it should be stamped into the disc from the factory and the TD should decide what is or isn't applicable.
Obviously the big rub here is manufacturers could absolutely and easily scrap overweight discs and out of spec wing profile discs but that would be extremely wasteful and would significantly eat into their production.