It's useful if your mental health issues are caused by Microsoft. For example, if I ever have to go through another license audit, I may have a psychotic break.
My company did (via dell) for employee workstations. Microsoft puts you though a site audit if you have anything they ever made. And if you have some products you also end up paying prices for things they didn't make. "You have network connect phones on the same vlan as a windows server? Here's a license for each phone, that'll be $8000 please. Now lets talk about all your printers..."