Solo queue shouldn't be balanced based on the power of a champion in professional play
Just read the sticky.
Fact of the matter is solo queue may as well be a completely different game compared to pro play. Top lane needs to be able to function with low cs/xp because they might be in a 2v1 lane. Jungle has to be able to function with less gold than a solo queue jungler because they have to babysit top/dive enemy top in a 2v1. Bot can pick whatever they want since they don't even have to lane as a 2v2. Mid and ADC are artificially made stronger than in solo queue because of the weakness of top/jungle when put in a 2v1 situation.
Why does Riot care how strong/weak a champion is in pro play. A champion like Riven will never be strong in pro play. The only lane that is pretty similar to solo queue is mid.
I'd also hazard a guess and say that no one would play this game if solo queue was like pro play. If the only experience I had of league was pro play, I'd think this game was terrible. Who thinks a 2v1 lane/ a 4v0 tower push is fun to play.