Because you are utterly unwilling to consider any other possible approach MIGHT be worth considering. Just "this is how it has always been, and it is right and correct and attempting ANY discussions on whether or not it is the absolute best method in all circumstances is a waste of everyone's time"
And, as I said, I get annoyed with the argument "I put in the most work therefore my opinions are the most important". You know, you constantly say that the DM has the be the final authority on all aspects of the game... but that is literally not true.
If the meeting place isn't the DM's house, or the DM isn't scheduling the meetings... maybe someone else is the final authority on the schedule.
If one of the players has far more experience and understanding of the rules than everyone else, DM included.... maybe they are the final authority on rules question.
One of my games the entire group came together to make a homebrew setting together. So who was the final authority on every detail of the setting? We were planning (and may be able to may not) to have rotating DMs, so which person is it? According to you we cannot possibly have a setting where we can all compromise, because we will inevitably hit a yes/no question that no compromise is possible on.
I'm not saying your approach is evil. I'm not saying you are a heartless tyrant who loves putting your boot on the necks of your players, but you just move to shut down any possibility that other opinions about how the role of DM should be looked at, and it kind of infuriates me that any time you get pushback about that, you want to default to "well, I've been a super popular DM for ten years, so obviously my opinion is unassailable." And yes, though I'm sure in person you are a much better person, via text you immediately shutting down all conversation the way you are with constantly asserting reality must be one way with the relationships between people DOES make it seem like you think your opinions are unassailable truth.