The biggest reason I see for accepting this is that OP_RETURN outputs are unspendable and can be pruned.
Stampchains are a much nastier way of storing data since they use bare multisig outputs which as far as I know can't be pruned and thus also pollute the UTXO set. OP_RETURN would be the lesser evil of the two.
I don't buy this logic that somehow we must appease bare multisig trolls with another open door / vector, to incentivize them to close their window a bit in exchange.
There's no guarantees that would be the case. The opposite could be true, especially when you look at who is advocating for this loosening of the default policy.
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