I have had solo Junglers that I've worked better with than my Jungle Main friend who I've got on voice chat.
My wife has had ADC's that she instantly works well with, even though they've never spoken a word to each other.
Somehow people have forgotten these things have existed throughout all of League. They want to instantly blame the premade, Dynamic Queue, and anything else that comes to mind.
Honestly, Riot could create a "Solo Queue" that was our current Dynamic Queue with chat turned off, and next to no one would be any the wiser. The "coordination" that's so often complained about isn't effecting the majority of players as much as a lone idiot does.