I think you missed my point. Firewire was also significantly faster than USB when it was announced and see where we are now. I paid extra for a laptop with Firewire ports and then paid extra for equipment that had firewire ports, they are all now expensive paperweights. I am not falling into that trap again.
Also, out of curiosity, do you believe that this laptop has the horsepower to run your 2 x 4K monitors with reasonable performance? Without the fans spinning at max speed all the time?