[MereInterest]

I think the argument is that while the total power over the full 4π is equal to the sum of the input power, the constructive/destructive interference cause there to be higher power output within some solid angle. But my understanding is that the limit are for avoiding interference from other devices, not for human safety, and that any reasonable amount of non-ionizing radiation is incredibly safe for humans. Congestion wouldn't be impacted by the beamforming, because on average any increase in intensity at one angle would be countered by a decrease at some other angle.

[marcan_42]

Higher power density, not higher power. You aren't going to get more watts anywhere than went in, but you will potentially get more watts per cm^2 than at the antenna.