In 2020 I and a few other people questioned the legality of the new
point charts. There were a lot of people that were convinced we were fools, the most common argument was that Disney has an army of lawyers, so if they did something it was certainly within their rights. And even if they weren't, the same army would crush us anyway.
Had we given up we would now have a bigger lockoff premium, all studios and 1BR would cost more points, Poly studios and CCV non-bungalows even more so.
And again, a couple of years later
DVC had to change how seasons where split, to avoid inflating point charts.
And again, one single member managed to make DVC change the way they reimburse taxes when a contract is sold.
So you see, DVC is not always right.
Also, argue your points, but don't hope to convince everyone, some people will just think DVC is always right.
That said, there are a lot of things that are already different between locations. For example us in Europe can never participate in sweepstakes. Membership extras are always paid with marketing budget, as long as nothing is paid with dues, it's difficult to argue based on the contracts. I think this might be difficult to win.