I do think each Nation does need some form of online verification.
It's pretty clear what kind of damage malicious actors can do by posing as a Nations citizens online, especially en masse and orchestrated. This problem is going to continue to get worse with the rise of LLMs.
The solution is better media literacy, better education, yatta yatta but that straight up ain't happen, and certainly not at the scale needed to circumvent that kind of damage.
What other solutions do we have other than Nation wide online verification systems?