The US federal government has been doing that to the states for a while now. They don't have the constitutional authority to do something, so instead they shove a lever under something they nominally are allowed to do and tell the states "do the thing we're not allowed to, the way we tell you to, or else." Where the "or else" is something like, they collect billions of tax dollars from your constituents that you then can't use to provide them with services, and return them to only the states that bend the knee.

(The US constitution originally required federal taxes to be apportioned for exactly that reason.)

Where is control in being mandated to implement and EU-wide, EU-defined system? This is a net loss.

My previous comment should be taken in its entirety. The loss of sovereignty of individual countries is comprehensive across all domains and this is just one brick in the wall.

This is nothing new, this is what "European integration" means. I wanted to point out the very newspeak-esque use of the term "sovereignty" in Europe at the moment.