If balance was perfect and you could make changes to gameplay, what would you change?
For me, I'd change it so that one ally in range gets your gold and exp if you kill a monster or minion. So things like duo jg or duo top would be viable, today's 'enchanters' would be made to be able to go to any other lane (as their items would be balanced around having solo carry gold), and things like double carry bot lane or double lane bully bot lane would work.