considering the labels are totally unnecessary, i don't see the problem. it's not like people are going to be plugging USB cables into the thunderbolt ports or the power cable into the HDMI port by accident.
Still, there is something of a problem in that sometimes people plug things in while the power is off, and computers are often kept tucked away in dim corners. Looking at the machine from an angle, it's not always obvious which connectors are where, especially if you're not a techy who could name ports in their sleep.
And probably patent-protected by Dell and needing licensing cost, instead of coming up with something they could patent themselves.
cries
(Yes, it's a workstation. Yes, I have worked with engineers who did this. Don't make life any harder for your users than you have to.)