Well, I wasn't here when there wasn't any chloroplasts, so.. I'm just used to it. Also, I suggest, instead of removing chloroplasts completely, why not make them an unreliable tool? In real life, sometimes there's a storm that blocks sunlight from getting to the plants. So why not add an option for storms, where the sun randomly turns on and off for random amounts of time? The plants don't get a constant energy source anymore, which means other plants evolve to attack the plants again.