Gaming has grown a lot and in many ways become like walt Disney selling characters and hopes and dreams and fantasies to kids and there needs to be more expertise involved across more disciplines like an actual mathematician to properly balance so many interconnected systems and someone familiar with ABA (applied behavior analysis) to tune the rewards system.
People are attached to their characters emotionally and you wouldnt want to destroy this by negatively impacting player psychology while working on game balancing post hoc to appease neckbeards who want their hipster build to be more viable.