That is a rather loaded question, but in short; yes, yes they have. Abandoned is actually a rather accurate descriptor, because it captures the neglect and negligence that has allowed the creeping metastasis of the EU (just to limit the scope for the purpose of this discussion). All one has to do is look around to notice that EU regulations and policies by unelected councils and bureaucrats has very much subverted and undermined not only national sovereignty, representative government, and the will and concerns of the people.
Ironically, the EU is essentially the mechanism of the emergence of the US empire after the Republic was destroyed in the US Civil War, albeit using a few different methods and methods, however resulting in the same constituent outcome ... centralization of power among a ruling class, which citizens have been deprived of.
In other words that may be more relatable to folks here, it's like being diluted out of company ownership. You are promised a certain percentage in exchange for your fundamental critical engineering work that gets the whole effort off the ground in the first place, and then when the moneyed interests come in they dilute you out of any kind of meaningful ownership, let alone value of the thing you created and built, which now others will abscond with and get wealthy from.
The EU has always been deeply corrupt scheme to essentially deconstruct the consequences of the revolutionary era following the US revolution, the same way that the US Civil War essentially reverted the US revolution and nullified the US Constitution.
My prediction if that we will likely in our lifetime see a kind of Oceana, consisting of all of Western Europe and the whole of the Americas, which "always has been at war with Eurasia".
The trajectory and the fingerprints of the plan is all there. US power consolidation, EU power consolidation and centralization, US deracination, EU power centralization, EU deracination, ... transatlantic integration ruled by a hereditary ruling class that will drone any resister "extremists" to cheers during hate weeks decrying disobedient subordination to the faceless machine with a theoretical ruling class that may as well be AI as it may be some hereditary demigods you will never lay eyes on. Are you adequately worshiping your holographic leaders? (in case anyone missed it, that was a reference to the UK Queen being projected as hologram in her carriage and people waving at a hologram)