Unfortunately, forgetting finances, waste, or anything else that comes into the equation, even if we wanted to, we just don't have the room to carry one of each option, for every person in each cabin.
Out of interest, would you, as passengers, prefer there to be less options in the premium cabins, maybe three choices rather than five, but more of each option? I sometimes wonder if we offer too many different things, thereby, almost shooting ourselves in the foot.