This is a question to reflect upon. Please remind yourself before answering, that unless you have a pro-contract, you are not a pro and should not argue like one. So.. why do we need smurfs?
In my opinion, we dont! Simple as that.
Ranked play, are for players to test themselves on as much equal terms as possible. (As discussed heavily last season, during the whole dynamicQ crap).
If you want to train a champ, just have fun or take a break from competitive play, you have the training ability, coop mode, bot mode, rotating game Q, custom games and blind pick. There is just no reason for anyone to have a smurf...
Not a good one anyways. What happens with smurfs?
They play in leagues they do not belong, creating an unfair advantage to their team.
They contribute to boosting players to a league they dont belong that creates an unfair advantage to their team.
They contribute to boosting accounts that get sold to toxic banned players that want to disregard proper behaviour and just buyt themselves back in.
Again.. there is no good argument, to allow having amurf accounts.
Solution: Require phone number and SMS identification upon creating a new account.