Nobody broke anything. A certificate had an expiry date. All certificates do. Those affected have insisted on using devices with old, expired certificates.
Nobody is forcing anybody to do anything. The solution is FREE to anyone that wants it. It may not be the solution that you're after, but that's why you have a choice not to upgrade and accept the consequences. Apple owes you nothing.
You might want to check things like Background App Refresh, and if Bluetooth is enabled unnecessarily. Also, any apps that you leave running will have an impact, regardless of whether you are actively using them or not.
It is *extremely* easy to manage these issues on your phone. You just need to do it.
1) Turn off wireless radios that you don't need. "Swipe Up-Tap", that's it.
2) Quit apps that you're not using. "Double-click, Swipe Up", that's it.