QuoteSoftware such as Maya is far more demanding and offer far more than blender, for example, and yet they require certified drivers, which is not present on GeForce.
That is false, i even worked with Maya with first Geforce DDR in 2000, no issue i remember off.
The only apps i had issue without Quaddro was some obscure high end CAD applications.
But for example CATIA worked with Geforce by late 200x's. Solidworks never had any problem.
PS: seems like another good definition Robert. But i think is mostly related to support level they get, insurance and passing the parcel... Basically who chooses a "workstation" is off the hook if anything wrong happens.