The ability to move licenses from one machine to another without access to the currently licensed machine. All of my music software (dorico, Cubase, tons of plugins) allow this. You can log in to a website and use that site to delicense a computer and license a different one.
I use two different computers depending on my location (never at the same time). Needing access to one computer to dellicense is extremely inconvenient. If I should forget, I’m completely screwed and have to drive hours to my other location to delicense. Also, if my machine should become lost or unbootable delicensing becomes impossible.