Apple is sneaky and disengenuous. Instead of “Yes” and “No” options to the dialogue like we’ve been instinctively trained to expect from decades of using computers, Apple makes it a “Yes” and “Yes, later” option.
After the 20th nag and you’re in a rush or doing something else important I completely understand how someone could overlook the fine print and choose the big option that isn’t “Install Now” and then just enter the passcode out of force of habit because they want or need the dialogue to go away as quickly as possible. Apple knows this, which is why they moved the “Ask me later” option to fine print.
We see people upset and disappointed that they did this posting here all the time, but especially around the time of major OS updates because: people are *humans* and they make *mistakes* — something certain types of people (you can tell who) have very little understanding of or compassion for. I choose not to associate with those kinds of people; the sort of people that are always right and can never admit any wrongdoing. The whole point of UI is ease of use and to minimise the likelihood of user error, so you could say this dialogue clearly isn’t good UI.
Of course, none of this would matter if Apple would let you downgrade. But it’s their intention to get people on the latest version of their operating system as a marketing tool to developers and to use any sneaky means possible to increase adoption while still validly maintaining their claim that they “don’t force updates”.
Consider it a learning experience. It was, after all, just a minor point update.