Even if Win10 was the greatest operating system to grace our pathetic species, you should not upgrade on principle. The shady practices used on other users (upgrading without their consent) should not be rewarded.
Beyond which, the inability to pick and choose which updates to install, along with the inability to turn off automatic updates* (instead only being able to delay them for a limited amount of time) make the system too risky and obstructive for all but the most casual of users.
What happens if a crippling update is rolled out? You're screwed. What happens if you're in the middle of rendering or playing a game and the system decides you've delayed it too long and need to update now? You're screwed.
Whatever the benefits the operating system itself may have, they are not, in my opinion, worth the large downsides that come with them.
*Apparently, if using Wifi, you can lie and say you have a metered connection to delay updates indefinitely, but that still means not being able to pick which updates to install.