Like he said, you still need to spend an insane amount of money to acquire spectrum. Furthermore, High freq spectrum doesn't go through trees or buildings so any obstruction then makes dozens of properties unserviceable. Unless you put AP's every 500m, it doesn't work out the way you'd think it would, and at that point, you might as well just run a physical drop cable to the premise for a few hundred dollars.

Not really up on it, but I am pretty sure the idea with mm wave stuff is to use the signal that reflects and refracts, not the direct path. The fact that it doesn't penetrate objects is a feature. It allows really intense frequency reuse in a relatively small area.

I know, that's also what makes it so difficult to deploy. You need to have dozens of them within a very small area. That essentially defeats the purpose of going wireless at all, since you'll need some kind of backhaul to those devices. Going from curb to premise is cheap relative to bringing the fiber to the curb.