Bill Zebub
“It’s probably Matt Mercer’s fault.”
Again, there is inconsistency. Frightening Presence has a chance of overriding "player decides". (If player fails their save, they can't decide to approach the dragon.) Charm has a chance of overriding player decides. (If player fails their save, they can't decide to treat their charmer as a neutral or hostile acquaintance.) Therefore player decides is uncertain under some game mechanics. There is nothing that tells us to exclude social skills from such mechanics. To do so is arbitrary.
Again, arbitrary. The specific of - an NPC passes off a disguise - is adequate to form an exception to the possible general of - players decide. Further, players decide is not an exception to the general of DM decides if a check is called for.
The social interaction rules provide said more specific rules. It is false to say that there is never a possibility (uncertainty) that a PC will be able to or forced to make a certain decision. Game mechanics regularly establish such uncertainty. The uncertainty argument presupposes that there is never uncertainty in players deciding, but that is not sustained - other than by turning a blind eye to or pleading as special cases everywhere else that uncertainty is established.
Look, you don't give much weight to the "roleplaying rule" on p. 185. I get it. And that's fine. Play however you like.
But the problem with all your arguments...that others are being contradictory, or circular, or inconsistent, or using special pleading, or whatever other passive-aggressive criticism you have...is that you ignore that other people don't share that fundamental interpretation. Even though you have been told otherwise repeatedly.
It's like you're trying to argue with us that Pi is equal to 3.0, and your argument relies on showing how our calculations don't add up, but you keep replacing our 3.14 with your 3.0. Well, duh, of course it breaks down if you replace part of our argument with your argument.
If Rule 185 is taken to be a general case rule, then it takes a specific rule to override it. Charm spells, Frightening Presence, etc., explicitly have those specific rules. The standard play loop does not contain such a specific rule. And if the criteria for specific rule were low enough that the standard play loop did qualify, then basically everything would qualify, which would render the general rule meaningless.