Should Programmers Upgrade from Windows 7 to Windows 10

Question

I am a VisualC# programmer and an individual Unity3d game developer. I wanted to know if there was any problem if I upgraded from my windows 7 to windows 10, I wanted to know if there is any difference in performance. And one more thing.. From a programmers point of view is there any feature that I would not be able to get if I do not activate windows,meaning that I use deactivated Windows because I donot think why should I activate it.

Answer 1

New Windows versions introduce new API. Eg GetSystemTimePreciseAsFileTime() was only added in Windows 8.