I was just surprised that it would move with no weight in the seat. Seems as if it shouldn't be able to do that. Time delay could be used for transient weight shifts.
Really what difference does it make? If someone is already going to the trouble of clicking the seat belt behind them and hanging a weight on the steering wheel do you somehow think that putting a weight plate on the seat before they sit down would be a step too far and they wouldn't do it?
Shoot Bjorn carries weights around with him so that he can keep the HVAC system running while he camps overnight in the VW ID.3... (Now that is a stupid restriction...)