If you are foreign to the US and want to get in you need to accept their conditions that they deem needed for your entry. Even though is a questionable practice, you are doing something (provide biometrics) in order to get something else (access to a foreign country)
The point here is that you are a CITIZEN of the EU, you need to subject to conditions that give you no benefit when traveling abroad.
> "The systems covered by the new rules would include the Schengen Information System, Eurodac, the Visa Information System (VIS) and three new systems: the European Criminal Records System for Third Country Nationals (ECRIS-TCN), the Entry/Exit System (EES) and the European Travel Information and Authorisation System (ETIAS),"
It looks like those are all travel-related systems rather than national identity systems?
You already need to submit biometric data in order to get a passport. That's how they get these data in the first place.
In EU countries that have ID cards you also already need to submit biometric data when applying for one.
This only merges existing databases, which is a reasonable thing to do when you have a single border (Schengen area) and obviously want to quickly check anyone.
The point here is that you are a CITIZEN of the EU, you need to subject to conditions that give you no benefit when traveling abroad.