I don’t really see that people are missing the point. Using the dongle is a compromise- inconvenience for me, security for the company. On the other hand there is a distinct advantage, as others are pointing out. No hassles with needing to connect to the Internet to install the daw on different computers.
I imagine the stated policy of a one-time-only ZDT license is to give SB a chance to prevent abuse. They would certainly evaluate a second request on its merits. Just like the eula paragraph allowing only 2 or 3 software installs at a time- I don’t think they are going to check, or even care if I install the software on a variety of machines, but in a legal case against piracy their lawyers probably think it helps. (whether that’s insane or not is another topic 
)
Finally, I think this is a solid way to prevent piracy of their products, since around 7 years ago, Cubase is not pirated.