Well but if you op-out you op-out of everything, including security updates. There's no "I want security updates but no random feature/interface changes" button.
As someone else mentioned, to support the enterprise Microsoft makes updates piecemeal and optional.
So, MS already pulled a stunt like that recently, why they would not do it again, specially if they want people to use some shiny new tech part of their 3e strategy?
Because I DIDN'T want Windows 8.1 installed, at all.
Unless you think this tutorial is useless and people invented it because they are liars too:
http://www.askvg.com/how-to-stop-automatic-forced-upgrade-fr...