I know this is what they've done for a few years now and we're just supposed to accept it, but it's one of the most infuriating things that Disney does. Guests are expected to arrange the details of their itineraries months in advance, yet Disney can't figure out whether or not its flagship park will be busy in July.
Perhaps if they weren't the nation's leading family vacation destination, or if they didn't have nearly 5 decades of experience, or if they were on the verge of bankruptcy, I would have a little more sympathy for this sort of thing. It just reeks of desperation to do the absolute bare minimum, while simultaneously putting unnecessary burdens on the guests.
Disney sells a premium product and is the industry leader, but acts like they've never done this before and they're not quite sure whether or not this whole theme park thing will still be around in 6 months. It's not unreasonable to expect them to know in April what they're doing this summer, or to expect them to have minimal fluctuations in hours over the course of any given week.
Disneyland is open 8am to midnight during all weekends and busy periods throughout the entire year, and has been for decades. Why can't MK figure out a similarly consistent schedule? Why are WDW guests only given the bare minimum, while being charged exorbitant prices and being forced to use unwieldy planning tools to get any sort of value out of their time?
This is an unforced error on Disney's part. It makes them look petty and aloof, with very little meaningful benefit. For a company that charges premium prices and positions itself as a premium product, it really isn't a good look.