If Riot wants to balance champs based on the top tiers only...
Why do champs that completely molest lower elos but suck in high elos even exist?
You think anyone enjoys playing against these guys, low or high elo? Riot won't do shit to them because "They're not that good in higher elos." No shit they're not gonna be good in higher elos. In higher elos, everyone goes full tank with maybe one damage item and runs away from 99% of all fights ever, because that's what they consider "balanced and fun." The only reason Riven is considered a pain in higher elos is because she has the ability to run away from every teamfight. Her massive damage? They don't give a shit about that. They like watching auto-reliant ADC's burn in hell. Elo hell.