Why do you turn the argument around and push it to the extreme to make a point? Nobody ever said you will get a guaranteed good run with high rio. People say you won't get a good dungeon run with no rio players or those who intentionally hide their score. Because in 9/10 cases the reason to hide your score is because it's low and you don't want others to see how low it is.
With rio active you might get a good run or a bad run but chances are to get a good run if rio is higher on average.
Without rio active you might get a good run or a bad run but chances are very high it will be a shit run.