We're past the point when most people can claim ignorance. And surely we have enough protection to at least defend against the "changed the terms and conditions after purchase" situation? They can't force me to do anything, and then stop working if I refuse.

For now maybe? Consumer protections are at an all time low at the moment. Your exact argument about “we all know this just nobody cares and stop whining” is exactly what will be cited if you attempt to take action if they brick your device.