6. So you're saying citizenship is what matters, not the passport?
No, I'm not saying that. Passports are very important for global mobility and residency, too.
Unfortunately, due to our modern nation-state system, people need passports (or a substitute) in order to cross borders without enormous difficulty.
A sovereign individual type needs multiple citizenships AND their corresponding multiple passports.
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https://www.malakoutilaw.com/handcuffs-of-the-passport-system-mobility-concepts