That's because not much has changed with the OS between Windows 7 and Windows 10. That's a big reason why many people are staying with Windows 7: It works just as well, is (currently) just as secure, doesn't spy on you as blatantly as Windows 10 does, and doesn't randomly reboot when you don't want it to.
I use both Windows 7 (desktop) and windows 10 (laptop). I haven't found much difference between the two, unless you count the time after Win10's release when they "accidentally" screwed Win7's update feature.
The Win10 features I like are the multiple desktops and bash on windows. I don't think these alone warrant an upgrade. Win10, however, has become much better since launch, when I found it to be utter trash.