The best course of action is (1) to try to find help on the mailing list for new functions to ease the migration to the new syntactic rules (there is one already in the release notes) and (2) to raise your voice on the mailing list and support those who share the same view.
I've been a release manager for 9.0, not the real maintainer, so things may have slipped in directions I didn't have time to carefully review. If I manage to get involved again as a real maintainer, I will enforce syntactic stability and backward compatibility as much as possible.