OK, a few thoughts and educated comments.
I think the attitude that
Disneyland is super cautious on what they do goes back to when the Park became a Resort. Some policies where before that, but Disney had to make so many adjustment and changes due to the failure of the original California Adventure. So they started to cut back hours at the parks, and then folks complained that they were not getting what was advertised. Also at the time, the rise of social media and that Disney was getting hit but a few main groups of people that some called "watchdogs". (And, yes I was one of them). This had them under a microscope they weren't used to.
But some of the Disney policies still surprise me today...
A big one is Hotel Reservations, every other Hotel in the area will "guarantee" your booking of things like King Beds, Bunk Beds, etc. Now, issues do come up, but then the Hotel works with you to find a solution. Disney doesn't want to deal with that,so they only take "requests", and if they can't deliver, it is "Oh Well, we didn't promise you anything, so sorry". Plus the fact the Front Desk staff is supposed to deal with the issue, and not get a manager involved.
Also they were cutting back costs, and found that "Traditions" training was too expensive, and a lot of "Customer comes first" was dropped, and instead,the park management attitude was what was best for them and making more profit, and therefore a larger bonus for them. So the attitude changed, and many old timers have stated that after they retired, having worked during multiple phases of the parks life.
Another key is that the mix of guests are more locals, and attend more often, so if you cut back the hours, they would be more vocal. Same with refurbs, and complaints when the project was delayed due to multiple factors.
So the attitude became, if we don't publicly announce it, we won't get complaints.
So many different factors, and that is only a few of them....