I don't see what the fuss is about. We've had ID cards here for decades and I don't see a problem in that at all.
It's pretty much like your driver's license. You hardly need it. I only get asked for it when dealing with authorities for example when registering a car or something like that. It can happen that you get asked for it when you buy alcohol and are still young so that the cash out person can verify that you are of legal age.