On the issue of refunds, to what degree is Disney advertising the new attraction, while downplaying the limited availability?
They did this when Galaxy's Edge opened last year. At the end of May, I was seeing commercials that basically said come on down, it's open. There was small print about capacity, but they failed to mention that the land was already 100% booked up via a reservation system for the first month. I imagine some ed off people showed up only to be surprised to find themselves locked out of the land.
For someone not in the know, they might reasonably expect to be able to arrive at 11:00 and experience this attraction, albeit with a long wait. That was always the norm until now. I don't see it as being particularly unreasonable to do refunds, as long as it includes the person leaving the park.