Opting in after Law and Justice opted out is pretty much impossible because two-thirds majority is needed for that, and Law and Justice would block attempts to do so.
the ECJ later ruled that the opt-opt had no force
Poland alone isn't enough anymore to keep that view of the EU since the UK left.
This artifact alone is legitimate grounds for non-participation in any such union.
And there you have laid the foundation for the obliteration of liberal institutions.
This purview has taken hold in the last 50-ish years around the world, leading to Judicial Supremacy.
I would use a polite term like 'absurd', but I think 'stupid' is a better term for the powers that courts have evolved to have, to the point wherein they de-facto make the law, which is not correct.
If the EU legislators, with 1000's of the nation's top lawyers, cannot enact legislation that is lawful, then something is very deeply wrong. How is it that a handful of other lawyers, sitting in a different institution can have a fundamentally different reading of the same thing?
Any ruling by the court that overturns relatively recent legislation should cause calamity and consternation.
At very least there should be a means to translate legislation into law that facilitates the participation of some officials to make sure that it's legal.
It's ridiculous that Europe's top lawyers make a treaty, and then some of Europe's other top lawyers say that it's illegal, whilst all reading the same, plain document. If the constitutionality of a law is 'not apparent' to Europe's top lawyers, then it's definitely not apparent to the other lawyers at the ECJ either; there should be a different process for determining the constitutionality of laws, that is separate from more common judicial rulings. And definitely the ECJ should not be able to rule on its own jurisdiction, this is crazy.
Love this bit from Wikipedia:
"The court ruled that the Community constitutes a new legal order, the subjects of which consist of not only the Member States but also their nationals. The principle of direct effect would have had little impact if Union law did not supersede national law. Without supremacy the Member States could simply ignore EU rules. In Costa v ENEL (1964), the court ruled that member states had definitively transferred sovereign rights to the Community and Union law could not be overridden by domestic law."
These are revolutionary proclamations.
"Oh, by the way, that treaty you signed that you thought meant that thing, well, we're going to rule that we have all the power. So, guess what, it meant something you didn't understand, and what you didn't know is that you were literally handing over sovereignty to us. Thanks, we own you now"