I see a lot of misunderstandings in some comments : we are not talking here about desired RF emissions but about unwanted EMC emissions at harmonic frequencies which just happen to interfere with the regular 2.4 GHz devices.This has nothing to do with how much spectrum is allocated to wifi vs mobile vs whatever... Here it is only about EMC (and it is well known for years that USB is difficult with EMC and it requires a lot of care on the PCB design !). And USB3 is not the only product that leads to difficulties : there are for example a lot of debates (at least in Europe) now with regards to the impact of LEDs (which might surprise a lot of people). Another example are debates on Wireless Power Transfer (which are desired emissions but with very strong harmonics that affect sensitive radio services)