You're going with the assumption that getting to a certain bracket is always deserved. As someone who has calibrated way too high after my placement matches (+5 more lucky matches), I would disagree. Someone gets lucky with wins and ends up stuck in plat 1? Who would want that? I wouldn't want that because I'd be playing out of my league all season, and players who actually belong to p1 would have to carry me every game. No thanks. If you would recommend there is somehow the option for a player to not allow himself to drop down a bracket, remember there are plenty of people who wouldn't mind dragging their team down as long as they get to keep the bragging rights of plat badge (that noone else cares about). And if you argue that your change makes more sense for plat-> legendary, remember all the win-trading and dodging going on there.