Earlier quoted context omitted.
I suppose they mean taking Apple's "We know what is good for you better than you do" approach. While Apple currently does not force OS upgrades, they do make a lot of decisions for their users without giving their users an opt-out or a way to roll back. This idea top-down, walled garden is pretty central to contemporary Apple.
Like what? Give examples. Apple makes design choices that are very opinionated on how you should use software and internals are hard to see, but they don't make decisions for you.
So now Flux no longer works, and there is no way to adjust the gamma on this device, which means I no longer like reading on it before bed. And there are plenty of other regressions in iOS 9 as well. And they forced me to update my desktop just to interact with it.
SO, Apple very much forced me to update, if I wanted to keep using my device. There is no reason that updating iOS should be required to factory reset it.