> ...the goal of the policy would be the same - to make all data about the person subject to the state's control.

That's one-sided thinking. The goal may well be to make the data not subject to the (lack of) control of a foreign state, namely the United States in this case, but any foreign state in the general case.

In fact the EU already mandates similar restrictions for data of EU citizens and special provisions for EU-US data transfers:

https://ec.europa.eu/info/law/law-topic/data-protection/data...