Here near Barcelona, ​​it was sunny almost all day today. It seems that sand in the air from Arfika did not reach these parts. Probably some air current prohibited his passage, restricted his movement, similar to a visa for travelers.

The concept you mention, without limits and equal for all, is the same as the concept of BTC.
No limits, no restrictions, easily and quickly portable...
But there are only 21 million BTC.
And man. at the beginning of the 20th century, there were 1.6 billion people, and at the end of 2022, about 8 billion. and without any restrictions on movement, the question of how the movement of so many people would affect the planet earth, the ecology and the culture of the people...
I agree that visas are crap and should be abolished (because of those visas, In 10 years I haven't been able to go to the UK with my own brother who moved away), but the passport format, as a document for the identification of travelers, I think should exist (it would registered those bad people, criminals and criminals whose movement should be restricted)...
Visa is (in this comparison with BTC) a similar restriction as when certain banks defend the purchase of crypto. They defend the free movement of our money, they defend whatever we try in relation to the bank - our money - crypto and thus limit our freedom.