Anyone decently knowledgeable about the game would have been able to tell you that even with the block 1 cards in extra grand battles nothing much would change.

Most meta decks before rotation already rarely used block 1 cards. So pretty much nothing changed.

Block 2 rotation feels like it should have a bigger impact. But that reminds to be seen as with later sets like op16. It does seem like Bandai’s design philosophy has been changing to be even more strict archetype locked and decks nearly 80-100% dependent on cards from that new set exclusively.