@art_of_shred said in Supported Mismatch - Can You Call That Supported?:

However, that doesn't mean that the vendor doesn't support their software within the parameters that they define (related to the OS, in this case).

Correct, but they don't support the product as usable. They require that part of it be unsupported. Wouldn't that taint the whole? It is their requirement alone that determines that it cannot be supported. They alone are responsible for it being unsupported. They could use different components or make their own but choose to make their software an addendum to something that is unsupported.