Personally, I think you're mistaken. Allowing anyone to propose a date outside of the control of the event creator can lead you to confusion for little or no benefit.
Personally, I think the value proposition is to avoid the long back-and-forth messages for finding a suitable time. This is not the same as finding the best fitting time spots for all participants.
Personally, I think the value proposition is to avoid the long back-and-forth messages for finding a suitable time. This is not the same as finding the best fitting time spots for all participants.