Dynamic Queue (Poll)
I have a group of friends that vary from 4 of us online to 10 of us online at a time, We all enjoy playing ranked together but we couldn't before with solo queue and if only 4 of us were online at a time, we couldn't play teams.
This is the problem that dynamic queue was implemented for. People who want to rank with friends but either had too many or not enough. People complained about this so Riot made dynamic queue.
A majority of people either like the new system or don't really care about it.