Color of usb ports

I just received a Dell laptop which should have 3x USB 3.0 ports, but every USB-port was black (2.0) as I usually thought… After some research i discovered that the way to identify the port is by the initials (“sss”=2.0, & “ss”=3.0), this kinda irritated me because the color way seems to be the dominating choice… So first of all… Is it only Dell who does this? And why? The color code is such a good system…