"you can just play with friends too" is not an argument to defend dynQ, and here is why.
In every single discussion about premades and how they negatively influence soloQ players experience, this sentence or a variation thereof will inevitably come up:
"Riot wants you to play with friends! Accept that! Play with friends! Just queue with premade!"
Oooookay. Here is a question for you 3 and 4man premades: Why are you not following your own advice?
What exactly prevents you from going on the boards, click "Team Recruitment" and find 2 or 1 more player for your premade? You tell us to play with friends, why don't you do the same? Because, if you now tell me "Because we are only 3 blablabla...", then you have no basis for using the above statements as argument to defend your queuing system.
Because, you are not really asking us to play with friends. On the contrary, you NEED us to play solo, in order for your queueing system to function, because without soloQers forced to fill, how would your 4man or 3man work? (It wouldn't, you would be stuck).
So stop using that as an argument. Its hypocritical, because you
a) you don't do yourself what you ask us to do, and
b) you DEPEND on us not following your advice