Very well explained, thank you. But why are all cases equiped with the same blue cable and connector? Surely it comes in other colors.USB 3.0 does in fact cause massive radio frequency interference on 2.4GHz so kills Wifi and Bluetooth dead.
If you google images of Wifi router boards you will see any that have a USB 3.0 port will have it located off in some far corner and all traces to it heavily shielded with metal plates. In fact the inability to pass FCC EMI certification testing is a major reason why devices that could actually use the extra performance still ship with USB 2.0 ports
I just looked up your case on Newegg. It does indeed have a black USB3.0 cable! First case I've seen that didn't have a blue one.My case (300r) has a black USB3.0 internal cable, motherboard header is also black (Z370 FTW).
So its not all anymore.