I think this is why SE only wanted to have solo queue get rewards, to prevent new players from wandering into the premade cherry-smasher factory. On the other hand, making solo queue ranked, and thus ranked at the mercy of the three randoms you get stuck with, is also a bad idea.
There should be a practice solo queue as well, so players can experiment with the feast without people freaking out about rank progression while they figure out how to PVP.