Hi Fd,
If one's made to believe that W10 won't work, there's good odds that it actually will not. The reverse applies too.
It is not necessarily that people think that W10 will not work, but that they can see that MS is repositioning itself as a cloud based Software As A Service provider and don't want to go down that route.
Even for free I don't see W10 adding value over W7. It's a personal choice and I accept that others can come to an entirely different view.
EG