Arenvald is hinted to be crushing on her in the SMN 80 quest.
But regardless he is here foil. He is also the one person she has an unmessy history with. Everyone else is somebody she once directly fought against and that tension is a core part of her arc post Stormblood.
There relationship is super cute though, its part of what made Healer the best written EW rolequest, and there happy high five at the end was so sweet.
Also, as for Estinien, calling him defanged is super goofy. Poking fun at the fact that he neglected every part of life that didn't involve fighting dragons and that logically left him unequipped for things like haggling or casual social situations is not defanging him.
Especially when the literal start of 6.1 shows he is fully capable of further growth. Everyone assumes he got duped into paying way to much again for the map only for him to immediately reveal he knows it was way overpriced but that doesn't really matter for his goals.
