100k op returns are being mined into blocks, and nodes have to take them to not fork. Removing the 80 byte op_return limit allows core to make transactions with larger op_returns. But most people don't use core to make their transactions. Removing the limit also allows those transactions into a (core) node's mempool. But if you don't let them in, and don't relay them, that does not prevent them from being mined into a block anyways. People (spammers) will get those transactions to miners out of band if core/knots is not relaying them. Not removing the op_return limit is putting your head in the sand, and incentivizing a buildout of an out of band transaction market controlled by centralized entities.