There is no must have OS out there. It has to be an individual choice. I have had Zero problems with Windows 7. Windows 10 however boots about 5 times as fast and Microsoft wanted a single OS that would work on all platforms. I do not use a touch screen nor a smart phone but Windows 10 is far better than Windows 7 as far as gaming goes. It is also more secure. The decision by MS was a pure Business Decision. If they can succeed in getting most windows 7 , 8 and 8.1 on Windows 10 they will still have huge profits even though it is a free upgrade.