I wouldn't have a problem with DynamicQ... If....
If there were no 3, 4, 5 premade group queues.. Just should have made it like SoloQ with a 2 set role picker. People would get the best of both worlds. Still being able to duo queue or solo, with the added option of pre picking your prefered role/roles.
You may say league is better with friends, but that's your opinion. How many were in favour of Dynamic queue again % wise? Somewhere in the higher 50s. Some people find the game better when it's more challenging (SoloQ).