I think something around the bulk and weight factor of good ski goggles (about 150g, as compared to the Quest 3's 722g and more if you want a headstrap that's actually comfortable) would be enough for AR devices to start seeing regular professional use (mechanics, plumbers, and so on) and to start showing up as mass-market media consumption/2D-game-console-replacement devices. At that point it would be comfortable enough for non-enthusiasts to wear for a few hours at a time without complaints.

Ok, if there were glasses I could put on that would in AR show me where everything I have is from the last time I put it down, as an ADHDer that would be a gamechanger. But, I also have zero faith in tech companies letting anything of that sort be private.

All of your examples except for the keys are the sorts of niche applications I think could work. But they aren't things that will make the average person want to incorporate them into their every-minute life.