None of these are managed solutions tied to hardware, so the comparisons are irrelevant. What hardware that [inherently] requires a managed service still exists

None of these are managed solutions tied to hardware, so the comparisons are irrelevant. What hardware that [inherently] requires a managed service still exists after 10 years? Jamboard inherently required the cloud for "jams". Google will allow for migration to other services that do the same thing and will compensate for the hardware. Zune is dead as well as the store and your other comparisons are disingenuous at best. Furthermore, you will still be able to use the Jamboard as a whiteboard and connect it to your computer. It will not stop working. These comparisons are just terrible.