Hancock's best feat is beating Pacifista that weren't fighting back. Had a chance to prove she is more than a horndog merchant, but then got casually choked out by Teach who couldn't do anything to the Seraphim. Couldn't even be Ace.
Crazy how far tits can take you.
Can't believe I'm arguing for Hancock here, but to be fair,
her Hax is quite overpowered how it seems...Even Teach was worried about getting into stone the second he would have let go of her, so it begs the question if haki is even capable of countering her ability.
If not, the only two options are being asexual and inflicting pain to yourself.
One is just coincidence and the other requires intel.
On the other hand Doffy has hax that serves as crowd control, but also is usefull against even calibers such as Dressrosa Sanji and even Jozu..Unlike Doffy, what Hancock is missing is actual combat feats as you mentioned though.