This could actually be useful and "polite" when you are in a full elevator. Often times there will be a packed elevator going to ground but it needs to stop+open+wait+close on every floor even though nobody can fit in. This just reduces throughput and can make rush periods stretch on for a long time.

I've always wondered if elevators code detect when they were full and avoid stopping for outside requests. Some combination of total weight + weight change could likely be a heuristic that improves performance overall.