Traffic lights are unquestionable authority
We all have to stop at the lights, but nobody calls it unfair because it happens equally to everyone. Soloq was the same; the games were a mess but everyone knew they had a 5/9 chance of not being on the team with the troll or afk so they dealt with it.
DQ allows some to bypass this, playing in groups to control the chaos. For the solo players the game hasn't changed much (yes, everyone is bot constantly, thats not because of premades that's the way ranked has been for a long time) but the fact that not everyone has to do the soloq struggle is offensive to them.
I've heard all sorts of arguments about why DQ was terrible or necessary or ruining ranked integrity or letting people boost (slower than normal boosting). Putting all that aside, the reason ppl are actually so offended by this is pretty ridiculous, and the rhetoric it's leading to is frankly insane.