Why DQ doesn't even achieve it's primary goal
This post by DinKaaaY shows to me that not only does DQ screw things for hardcore players and competitive, it also doesn't make much of a difference for casuals:
"I like dynamicq cuz i play casually and only really like playing with pals, if it was removed i wouldnt be bothered because i play casually and would just play normals with pals. No idea why riot wants to hurt the competitive serious players and cater for casuals who really arent bothered when things change.
Truly am sorry they took your soloq
away xox"