I would also add scale matters.

Some minor % of the population doing what they want? Eh, who cares, thats called freedom.

A large chunk of the population having their experience changed in a very important manner by default is a whole other ball game.

Well yeah, which is why you have to specifically go out and buy a "Copilot" computer that prominently advertises this as the reason you would want it. Does that meet the bar for disabled by default?

It seems really implausible that someone would find themselves using one of these PCs and not knowing it.

Given how heavily they’re pushing these AI features, I have to assume in a few years all mid to high end offerings from virtually every big brand will be a Copilot+ PC (MS is still the king at naming things btw). After all the only differentiator is a NPU.

Very plausible. I'm pretty sure the vast majority of purchasers have only a dim notion of what RAM beyond more==better is, let alone "Copilot". Especially if it is marketed as a feature, which it is.