Not sure if you're referring to just the original Surface Pro but there's quite a bit of difference between the original Surface Pro running Windows 8.0 and a Surface Pro 3 running Windows 10. There is one use case that I know is niche but still has a following that will spend money on Windows device that are good at it and that's inking.
Windows 10 seems to have closed the gap on the viability of a hybrid OS. While 10 isn't as elegant as 8 in some ways on tablets it is effective. My wife has been using 10 on her tablet for a few days and she's pick it up fine. One thing that does make it easier is having the task bar and other chrome on screen what 8 didn't have. And 10 certainly gets the consensus as been a much better desktop OS than 8.x.
Do you have some sort of bot that informs you of every post where the word Windows is used? Geez.