Why is listening to pro players a bad thing?

I always here the argument that riot listens to the pro players more than the casual players. In my opinion, the pro players are obviously better at the game, and they would know how to balance it and possibly make it better when compared to someone who is a blitzcrank one trick that thinks riven is overpowered.

I understand the argument that you need to make it casual friendly for new players, but there are games out there that is brutal on new players. Rainbow six siege and dota have steep learning curves and requires you to dedicate time and effort to learn everything about them. And to me that’s why I like rainbow six so much, and why I like lol so much when I started. I wanted to learn everything about them, and despite that I’m still not that good, but I want to keep getting better.

Call of duty is a very casual game that you can just pick up and play. There is a gap between good players and bad players, but you don’t need to learn every little thing to do well. It just helps. If you want to make a very competitive game like lol, seige, dota, or counterstrike, it just makes sense to me that you should listen to the really good players that play the game for a living.

I am a casual player, I don’t like ranked very much, I just play for fun. However, I completely understand why they would rather listen to Samsung galaxy players about balance than they would listen to me.

So what am I missing here? Why is this such a bad thing?