I've never found a clear answer as to what fringe edge-case Core 30 fixes by greatly increasing the OP_RETURN filter. Of course, you can't stop people from embedding data on chain. However, I don't think the answer is to make it much much easier to do so (unless there is an explanation that has escaped me).

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Op_return data is prunable. Utxo bloat is far worse for low powered nodes. The technical challenges of spamming the chain with a bunch of small op return vs one large one is minimal therefore a limitation op return is also pointless.