If you can maintain your screen's maximum framerate at all times, then not really. If you can't, then yes.If triple buffering is applied by windows 10 is there really much point in having the ability to use GSync/FreeSync in non-exclusive full screen? Do the drivers circumvent Windows when GSync/FreeSync is working correctly?
I guess I will have to check my display's FPS counter next time I'm playing a game in windowed mode...