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.
By that I mean that they're easily blocked, diffracted, whatever.