The issue isn't dueling the Grand Duelist
The issue is why is the Grand Duelist actually good in team fight?
Gets a shield from the support and goes nuts after 3 items. Can reposition easily and block incoming CC or burst. If she was just really good at 1v1ing it would make sense. She shouldn't be good at teamfighting too. Why does a duelist provide a massive AoE heal for her entire team? It makes absolutely no sense from a thematical or gameplay perspective.
Honestly the real Grand Duelist is probably this guy
. He even beats Fiora in a 1v1 lategame, but he's absolutely god awful when people group up. Makes more sense than someone who heals their whole team at least
:( this is his life in a 5v5 teamfight, especially if
a lot more in top/jg, his kit actually synergizes well w/ tank items (b/c of lifesteal, DR on E) and can dive in without getting insta-deleted and can do more meaningful damage w/
into full tank than jax going for 1-2 damage items into full tank.
is not tanky >.>