> All of the telemetry anti-features were backported into those versions
You don't have to install them, installing only security updates was still am option last time I checked it.
On top of it, even if you install them they can be turned off completely, and they are turned off by default, contrary to Windows 10 where you can't turn off telemetry.
> Contrary to popular belief, there is no good reason to be running Windows 7 or 8.1.
Yes there are. Windows 7/8.1 performs better and more snappy.
Windows 7 (and 8.1 with a classical standard menu extension to hide "modern" parts) has a more consistent interface unlike Windows 10 ui which is all over your face with inconsistent menus, colors, sizes etc. stinking out of everywhere. Half baked app choices with some modern and some classical apps and you don't know which one will open from which settings menu.
Forced updates whenever Windows feels like. There is no option out because pesky users can't be trusted.