u/LongjumpingDig3878

*Only for small stacks, solo-duo queue.
The reason I think this is because with placement matches you only need to play 5 games to get to your skill instead of atleast like 60 games. And the people that you are playing with should be around your skill level(teamates and enemys). So, if you play well it should have a greater effect because the games skill level should be equal. For high champ IDK, but for gold-diamond it actually might be better for solo queue players.