MMR is too heavily prioritized, as an example, I’m currently in Gold 2, but ALL of my matches are with diamonds. This is because my individual MMR is diamond level. That sounds great on paper, but in actuality, it sucks big time because I have to work 3x as hard to get into my ‘real’ rank.

While yes, you will be rewarded more and lose less, it will still require me to play a CRAP ton of games to get into my ‘real’ rank. Which is hours upon hours of time. If i was originally placed into diamond, I would likely never go below it, but because I was placed in gold, I will likely never hit diamond unless I play a LOT of games