Most PCs do at this point, also that secure enclave is very rarely both effective and something empowering the user so it's often ignored outside of very closed systems like Macs and phones.

Not sure what you’re saying here — most PCs have the hardware but they don’t use it?

Or in some cases implement it so poorly you'd be better off not having it. But hey, let's just check that box anyway.

Reverse perspective: Outside the "Walled Garden", perhaps "Solitary Confinement" isn't seen as all that much of a selling point.