Ah one more thing. There's a thing called feint or dummy attack.
In a case of defending a castle you use feint to get more defenders on particular side of castle (where feint happen) and then strike in completely different place.
In case of Bitcoin I believe that OP_RETURN is a feint, IMO also that stuff about quantum computers is also designed against Bitcoin.
Not that work on quantum resistant signatures should stop, absolutely not.
Fungibility seems most important to me.