I don't think there is a way to prune just OP_RETURN, i need a Full Node with TXINDEX enabled so a can't delete JPEGS.

With spam filters i can try to block JPEGS and i think on long term Miners who accept SPAM directly will loose hashrate in the future.

Just a little part of UTXO set is in RAM, most of it is on storage.

The idea of wrong estimator fee because i don't see the transaction, it' a fake problem.

This is my opinion