Cool, so they narrowed the gap to the point where it's almost fair and balanced. Good job nearly fixing your broken system, Riot! They also almost fixed high level matchmaking being absolute garbage always (if you sweep the godawful experience that is autofill under the rug). Really, absolutely astounding work. They're nearly back to the state things were in before! *applause intensifies* /s
Dynamic queue definitely matters below diamond. Coordination was a step up from the anarchy of solo queue no matter what level you play at, full stop. All of the high level players I've kept up with since I stopped playing have pretty much kept the same tone that dynamic queue is horrible no matter what skill bracket you play in. To claim that somehow Diamond is the cutoff for where coordination matters is pretty absurd. Coordination matters at all skill levels, full stop.
That roundtable was actually the impetus to finally make me quit. I don't know how you can possibly see it as anything but a further damnation on dynamic queue. The video is half an hour of Scarra and gbay starting to say something about how much they hate dynamic queue, getting interrupted by one of the rioters who then mention something about "yeah we messed up there but we're working on it". I don't think Scarra got in a full thought once without being cut off and the rioters trying to redirect the conversation so they don't have to actually discuss any of the major issues with dynamic queue they still haven't addressed. The most insulting part to me was that even gbay who represented the decidedly more casual section of the playerbase wasn't allowed to speak unless it was praising the fact he got to play with friends in a competitive environment. That table was decidedly rectangular, with the playerbase being shoved to the very far end while Riot gave a "It's bad but deal with it, bitches" speech.
On top of that, that was when Riot revealed that they had never been planning on adding a solo queue mode. Ever. Every single time they had said they were going to make one, or were trying to make one but were having technical problems but it was coming, every time it was a bold faced lie because fuck you for wanting to play alone, bring more wallets with you when you play or get the fuck out of their game.
I'm in the skill bracket where I'm never against stacks, but that doesn't make it any less shitty on Riot's part and there's plenty of other games that don't like to take a dump on my market segment. So that's why I quit.