Fragility is a benefit; it reduces interference. This could be used for wireless VR goggles, for example.

The alleged/misunderstood "fragility" can be exploited though. A lot of residential walls are gypsum board, which contains a lot of water, and attenuates microwave signals.

Rather than fight this by trying to shout as loud as you can from a single AP across the house, you can put smaller, weaker APs in multiple rooms. Because of the excellent open air penetration and high frequency, you can get a multi-gig links with no interference or competition.

As long as the signal can make it all the way from a phone in my pocket to earphones or glasses on my head it's useful.

Not much different than 5Ghz which is heavily used currently.

6ghz isn't very fragile, 60ghz is