I’m not a “sovereign person” but I do understand their problem with SS#s; people pretend we don’t have national ID cards but we do.
Thus, for purposes of Social Security verification when you turn 65, one needs to show up in person with your drivers' license, original social security card, and an original or officially certified copy of your birth certificate. That requirement shows the limitations of a social security card as a national ID: not even the Social Security Administration fully trusts it and requires more for ID verification purposes.