Can you provide me an example of a single national regulation that is an unambiguous uncompromising good, that could not be accomplished in a better way on an international level?

Of course I'm being facetious and I'm sure you understand why this is a not a useful question for me to ask. In practice, there is no such thing as a regulation that is "an unambiguous uncompromising good" and each decision about regulation involves a series of tradeoffs. Don't create straw men.

Unless the EU law is optimal you could always argue it could be better at a national level. So none?

Can you provide us with any single regulation that is an unambiguous uncompromising good?

Hell, are you even sure that “unambiguous uncompromising good” is a thing that can actually exist in any group of humans?

This is a straw man fallacy.

See:

> EU regulations are not a monolith of good or bad.