Because if the EU tried to force countries into single compliance, there would no end of "EU is trampling national interests" and similar screaming.
It's an unwinnable situation. Again, EU-level politics keep assuming everyone (corporations and states) are adults. Unfortunately, everyone are just a bunch of screaming, scheming petulant children.
It's an unwinnable situation. Again, EU-level politics keep assuming everyone (corporations and states) are adults. Unfortunately, everyone are just a bunch of screaming, scheming petulant children.