Hi @Anonymous - there are a number of ways that Revit can apply diversity factors to account for such non-coincidence. In fact, even within a single panel, there are ways to apply diversity (e.g., see the example of elevators, clothes driers, or x-rays.. a factor is applied depending on how many are connected). These demand factors propagate up through the distribution. For example, 4 elevators on one panel could have a total demand of 85%... if there was two such panels connected to a common main panel, the total of 8 elevators would result in a demand of 75%.
Alternatively, you could create a calculated field in the panel schedule to compute such a diversity if it is just a factor of the total connected load. Would that be sufficient? Example is shown below. In such case, perhaps you'd want to remove the <Total Estimated Demand> and <Total Estimated Demand Current> properties?