"The fuss" is about the forcing of the upgrade. Before I disabled it, there was an icon that would pop out of my system tray several times a day to tell me to upgrade to Windows 10; if I was fool enough to click on it, it would give me two options: "Upgrade now" or "Upgrade later (by which, it implied, it meant 'next time I restart')". There was no "F*** off and leave me alone" option, or even a "Ask me again in six months" - pressing <Alt>-<F4> was the ONLY way to make the prompt go away without installing Windows 10 - and even then it would keep reappearing.
How did I disable it? By editing the registry. Manually. Myself. No button to click, no options in the Control Panel would have that effect.
Now, I hear the latest version of the upgrade will, if I'm sloppy enough to allow it to be applied, actually rewrite my registry settings. So the thing I've gone (way) out of my way to opt out of, will happen anyway. At this point I'm this > < close to disabling automatic updates entirely, which is the opposite of what Microsoft claims they want their users to do.
I'm pretty hacked off about that. If Windows 10 guaranteed to preserve all the functionality of my present version (8.1), guaranteed NOT to impose any new license terms and conditions on my usage, NOT to weaken my privacy, and to guarantee me support for the lifetime of Microsoft Corporation, I'd still be hacked off about having the upgrade forced on me like that. And as it happens, it doesn't promise any of those things.