Smartphones started in a very different time. Our point of reference were PCs and laptops, where we were the owner and could do pretty much anything we want. They took a lot of that away with smartphones, but because smartphones started in the in-between times, they (at least Android) still have side-loading, the possibility of installing browsers with ad blockers, heck even the source code in the form of AOSP, etc.

You can be sure that almost twenty years later, they will use a new device type as an excuse to lock things further down. Remote attestation, no side-loading, no or little browser competition, etc. This has kind of already happened with smart watches, where there is no AOSP-equivalent, virtually no models with unlockable bootloaders, etc.

AR glasses will be the next venue to further trample on your rights. The difference compared to smart watches is that they could potentially replace smartphones.

All this is without taking into account the grave privacy violation AR glasses are to other people. Yes, phones can also make photos and film, but it is much more visible.

Luckily, at least where I live, most people find AR glasses creepy and there is a majority of parliament that wants to ban them (though the government is kinda weak as usual).