From my understanding of OP combat, nothing is better than a sword, not a single DF, not even the broken ones and DF is pointless since Shanks has none...
Have Katakuri, Big Mom or Kaido smoked Mihawk? No, so I dont see a point in that one either. The reason why he doesnt have a win over Shanks is because it eould ruin Shanks' hype who is an important figure for the MC. Oda is not ruining anyone's hype and certainly not Shanks'. We know Mihawk is stronger, giving Shanks a clear L achivess nothing except lowering his hype which Oda certainly isnt after, at least not at this point.
Even the guy who is hyped up through Ls is not given one in his prime or anytime recently or by anyone known.
Back to the reason why I quoted you - anything that Shanks can do without a sword is not better than what he can do with a sword.