On the other hand, there are countries that use national IDs to restrict the freedom of their citizens. You can't base your reasoning about something like this

On the other hand, there are countries that use national IDs to restrict the freedom of their citizens. You can't base your reasoning about something like this solely on what's happening in some countries right now. That's how SSN mess started in the first place. They weren't intended as a global identifier, there were concerns that they will be used as such, but those concerns were ignored. Also, I'm not convinced that spinning up a new ID system is necessary to solve the issue at hand.