I said nothing about the cardboard waifu.
Nothing! But no, Pyrrha and Jaune's relationship could have been used much better.
But that would have required it to have been built better and had more screen time for it to develop.
Sadly a previous lack of budget hammered this in the head and the episodes were way too short. People bitched about each volume's "Jaune arc" for a reason yo.
That said, I feel like the writers were writing a show for a full thirty minute timeslot rather than the five to ten minute sections we got. If we had more time I figure people would have been more welcoming of team JNPR as a whole.
Back to Jaune and Pyrrha and their relationship and how it could have made them both develop better, you'd first have to develop them on their own for a spell.
They did with Jaune, he faked his way in and wanted to grow out of being the comic relief character he knew he is. He has seven sisters and takes his promises seriously even if they are made in passing. He's apparently relyable enough for Ruby to phone on her scroll and worried enough about her to abandon his mission and drag NPR along with the "look for Ruby" quest. It didn't last long sure, but they were also willing to follow him and that speaks a of a certain bond with his team.
In comparison what do we have with Pyrrha? She's easy going and believes in destiny, a great fighter at a champion level for her age with a powerful semblance and is skilled with subtly using it. She's been isolated from previous friends and family that she connected with Jaune quickly and became close friends with her team as a result, even gaining a friendship with team RWBY and (if Jaundice is anything to go by) has some level of friendship with Ruby beyond what she does with her team.
This was me exaggerating massively.
They could have been good together, real good. But they'd both need to be good enough on their own. Not that it wouldn't be possible.