Not that there aren’t a bunch of other issues for every day wear. (I wear contacts for vision correction because I find glasses very annoying).
It also has to be impossible for failure of the hinges to lead to damage of the electronic components. I've lost multiple laptops to hinges twisting in ways that they shouldn't have and fracturing the motherboard or keyboard, and that's in a form factor that gets much less abuse than glasses.
citation needed. For me, it's the scratches and the surface issues. Even though I have no problem taking care of my regular glasses for years, most of my sunglasses become unusable and hard to see through from deteriorating surface and scratches after 6-10 months. No matter if I get $30 or $300 ones.
With regard to AR glasses, I would put the expensive part in my pocket like a phone, and the glasses would be just like the wireless earbuds, easily disposable / replaceable.
If they had some tint and UV protection and I would consider using them as shades.
update: I talked myself in looking at the hardware store website and my next sunglasses will be be some 3M safety glasses with a dark tint and uv. And less than $20.
edit To be clear, I don't think we're anywhere near having cheap AR glasses that can just delegate all the work - rather I think there's so much compute that's necessary, we need the combination of what we can fit onboard the glasses and in our phones to make a compelling product.