1. Witness is more prunable than opreturn
2. Witness propagates as fast as opreturn
3. Witness is much better for this
and witness is much cheaper.
Again, why?
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This is incorrect. Op_return data creates is provably unspendable outputs. Witness that is unspendable remains in the utxo and must remain for a node to stay in consensus.
Op return was created because of its prunable nature.