You’re wrong.
Plain and simple
Look at hours from the 90’s and see what time the park was slowing on non peak nights
but regardless even more recently, the reason the hours shifted to 9-10 instead of 11 was attendance based. You can deny this… but you will remain wrong. Park hours are always based on forecasted park attendance.
I get what you’re saying, and I don’t doubt you have far more info about the inner working of WDW decision making than I, but it seems odd that hours would be based on park attendance if hours from 2001-2019 dropped 5.8%, while attendance increased 22.3% over the same period.
Another interesting point when comparing the daily MK hours between 2011 and 2019 is that Disney seemed to make a concerted effort to normalize hours over time. While MK hours in 2011 changed almost on a daily basis, 2019 had many more and longer periods where MK’s hours were the same day to day.