Your conclusion doesn't follow your argument, and your analogy is apples to oranges.
960 players should not be allowed to play INT. AM2 and AM3 are ratings-protected divisions, AM1 and Open are not.
Nobody should be forced to move up to Open, if they want to be an amateur who cares if they "outclass everybody"? Again, it's not a ratings protected division, it's a division for people who do not want to pursue disc golf professionally. Remember, professionally does not mean touring, it means playing for money.
The problem is your argument, and the way many people look at it so not just you, is that AM1 is a ratings protected version of Open...which is NOT the case.
The logical conclusion to the argument you're positing is to do away with all ratings protected divisions if you want to level the playing field...which VOILA is what the AM Worlds tournament is...