citrea was originally going to do a combination of small OP_RETURN and witness stuffing. in fact they could do it today with zero changes to anyone's node. core asked them to just do OP_RETURN and no witness stuffing because then everything would be prunable. you want that.
Discussion
so, why can't citrea do it with just small op_return ? if citrea's fees economy needs to polute witness, maybe they're not so good guys.
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so, because citrea's need to pollute utxo (op_return can't accommodate 144 B zk-proofs), core's devs propose remove the cap instead of a small increase.
bad actors on a bad play.