You can only achieve that when u shoot only one single CFAST card in the slot as the CF slot with a card inside will slow down the FPS(what is your take on this?)
Also USB C should have been implemented and there are plenty who have requested for this to be part of the camera.
It is advertised as up to 14 fps. You can't get 14 fps while shooting with a shutter speed of 1/4th of a second either, and that is expected. If it can hit 14fps at Canon's specified settings (1/1000th, wide open, < ISO 51200, CFast, LP-E14 battery) then I am fine.
Who requested USB C to be part of the camera? I have not read that anywhere. Sports pros don't download images off camera via USB -- they just take the card out and use a card reader. USB-C is also not as useful as Ethernet (which both the 1DX2 and the D5 has) for remote shooting and downloading either.