5 bans will ruin the competitive scene unless implemented in a Dota 2 format
Dota 2 can only make it work because of the wide array of options. Dota 2 has probably more than twice the number of viable options for any given role, and that's IF 80+% of league of legends champions were viable. If the majority of champions in the game were competitively viable, dota 2's options would still be twice as wide. And EVEN THEN Dota 2 has implemented the system so that it's not 5 bans upfront. If we get to 5 bans upfront, we're going to see the most diversity-shot meta that league of legends has ever seen.