Whats the point of placements if its just gonna but you in a lower tier?

"All players undergo a ‘soft reset’ at the beginning of each season, so your new rank will likely be lower than it was at the end of the previous season."

I rather just have the option to pick the lower rank than to waste my time and play 10 games. I understand placements are probably necessary for a new player who is starting rank but after that if you can't get the same or higher rank than last season whats the point.