This is a big thing.A ship's performance in a duel is not always indicative of it's overall PvP utility or representation.
Like, if I wanted to go into an organised wingfight or duel, I'd have to put myself a completely new loadout together as none of my existing ships are really suited to that.
A duelling setup, likewise, wouldn't really be suitable for the things that I do tend to use my ships for. I mean... assassination missions, I guess? Even with massacres there's a stark difference in loadout between a ship built to take on a single tough opponent and a ship built to take on fifty weak ones.
If I stumble into another cmdr in a conflict zone, I'm not likely to be flying a dedicated pvp ship. I'm there for pve - and in open, that means "built to do pve, but capable of handling an encounter with another cmdr who is also there to do pve".