Dynamic Q has a flaw: it encourages one-trick-playing:

It seems to happen more often this season. Getting players who only know how to play one champ on one role. It goes as far as they can't even play their secondary role, but instead ask for whoever has their primary to swap - and will probably feed if they can't swap.

Back in my day (oh man I sound like an old man) being good at ranked meant specializing in about two roles while at the same time, BEING ABLE TO PLAY EVERY OTHER ROLE AT LEAST SOMEWHAT DECENT. Sure, if it wasn't your main you wouldn't make any big dick plays, but you'd be able to perform on a basic level and keep feed to a minimum. Also, the need for that increased your knownledge of the game as you shifted perspective sometimes.

Right now it's more about spamming one currently strong champ and that champ alone - and with dynamic queue you can be sure that you get your role/position in comparison to old ranked. Sure, not having any quarrels about who goes where in champ select is surely nice, considering how toxic they can get, but like this people who clearly lack basic skills are allowed to climb - and that kind of disorts ranked. Ya know, back in the day I was kind of proud of having it made into Gold or Plat. But with the higher ranks being flooded by one-trick-players they kind of lose their value...

Hextech Crafting seems to do something against it, but that's a drop on the hot stone. Get an S on ONE champion once a week, then go back to playing whatever you were before. Not that an S is very hard. Get >300 CS, don't feed, and you might get one even if you lose (that happened to me once).