Losing 2 is enough to brick a character for another 10 hours. worth of queuing. Similar to shuffle going 3-3 a few times can basically stick your mmr right at where it starts for another few 6-0s or 5-1s its all about the time investment not the actually can i increase, can i decrease.
The ladder needs to be far more volatile and a slight amount of fixes need to be done to CC durations and healer tankiness, the game will actually be able to run on the small ladder it has atm without impacting how good the game feels 2600+ where people are playing to win without going for any specific reward.
47% win/loss ratioing a 2400 lobby is far easier then 63%ing a 1800-2400 for basically any healer in shuffles and any other comp in 3s.