Assuming, arguendo, that corruption is somehow not a factor in your scenario, it still doesn't account for ignorance. Consider that jurors in jury trials have one binary decision to make based on the facts and law given to them. They don't need to decide if the law is just (in fact that's explicitly NOT what they're supposed to do). They don't need (and are not supposed) to decide if the situation is fair. That happens elsewhere by folks trained to consider these things. Jurors in jury trials literally apply the law they are given to the evidence they are presented. That's it. Even this burden is often more than a lot of folks can wrap their head around.

The legislature, however, is not there just to nod its head when they think something is a good idea and voting no when it's not. Even if we were to create a space for exactly that, all we've done is push the fallibility to those who are doing the work to write and revise law--but now they're pitching to those off the streets who don't know anything about governance! If anything, lay congresspeople would magnify, not reduce, the problems we have with our current system.