^ You've clearly gotten it all figured out.
Getting rid of ticket media wasn't required
Removing room keys wasn't required
Having a way to pay for stuff without a card wasn't required
Making advance dining and ride reservations via the web wasn't required
Having interactive signage and queues wasn't required
Having in park and in hotel wifi wasn't required
Ordering food via and app wasn't required
Having a system that better distributes crowds to smaller attractions wasn't required
Having showtimes, queue lengths, maps and other things accessible wasn't required
None of those were required. But they're things that guests were asking for, regardless of whether or not they add value to YOUR visit is irrelevant. These are all net positives in most guests eyes, regardless of your and a few other's bellyaching about progress. And yes, they certainly made these investments to create efficiencies and monetary advantages. Shocker. They made a billion+ dollar investment and they expect it to generate returns. What a novel concept. And mostly, they're all things that came included in a massive telecom upgrade that was absolutely required whether it had direct money benefits or not.
By the way, Shanghai has MM+'s infrastructure built in, they're just not using Magicbands. The backbone is there. It's also being installed at DLR and DLP as I type this. The point person is a good friend of mine. But again, since you're not aware of any of the true motives, uses or underlying advantages of the system, I don't expect you to grasp why it's a good idea for guests and/or the company. But go ahead, keep demonstrating how clueless you are when you say other parks are passing on this.