Yes, Nets run plays for Lopez down at the low post, that's why he can consistently get 10-15 points a game. And if Lopez doesn't perform, it's his fault. What plays do the Nets run through Yi or Simmons? They are role players on the offense, they get open when their defender leave them to help out in the paint. If other team decides just stay on them, they are not going to get many oppotunities in set plays. how can they be consistent? Yi does get some touches 30 feet away from the basket on top of the key, what do you expect a 7 footer to do from there? Driving to the hoop like a guard and create for others? that's what Harris and VC do. If he takes a couple dribbles and take a semi contested shot, people say that's a dumb shot.
you can make an argument that Yi and simmons haven't been knocking down shots others created for them, that could be a problem, but I think both of them will improve as the season goes on. As far as consistency goes, until Nets run some play through them, they won't be consistent. Lets just hope they knock down their open shots and stop complaining why he didn't score 20 points every game. Their main purpose are really just stretch the floor for others.