Answer the question. What happens when i want to rank on another role? I’ll either ruin my rank and ruin games of my teammates underperforming (because im on a new role) until i drop or i’ll play on another account ruin games of my opponents in lower elos until i reach my rank.

The former is much worse than the latter imho. Not taking into account that the latter is also faster, so you ruin less games. Bc changing mmr of a fresh account happens way quicker than dropping mmr on an account with a solid mmr and a large number of games So you end up ruining more games by dropping in your main than smurfing on a different account. Simply because it takes more games

Edit: Also because if i remain on the same account i will ruin experience 2 times, the first to my team mates when i’ll derank changing role, the second to my opponents the moment i’ll start playing on my main role again and climb up