Couldn't you always just coinjoin a small UTXO and use it to help pay the fee? Obviously that adds to size & fee, but at least it's not dust (as in something that's useless; the miner can definitely use it).
If I am wrong please someone explain why. If you add a UTXO to a transaction this increases the weight/complexity and while that goes to the miner it doesn't help you the transaction actor very much. I don't know if you net out better than simply not adding the small UTXO to the transaction.
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You're right. This is just concerned with economically unspendable outputs. They should always be spendable, right? It's just a question of making sure you're setting yourself up in the best position in the long term when the days of sub 150 sats per vByte fees will be long gone.
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