It's completly pointless and irrelevant to even include that conversation in the first place without showing that flashback CW era duel scene. Ruindriguez is dumb.
The straights wouldnt even know what such a throwback scene was in reference to, though.
Bane got treated like Maul got treated: as a throwaway device to advance the plot, whether he was someone who could be used in the future or not.
Still amusing to get lectured about one's own bloodthirstiness by some bounty hunter who's been murdering his way across the galaxy for decades, though. STFU Cad Bane, aint nobody taking no moral dressing-down by the likes of you.