I could see the use of having a dynamically changing pin color property/attribute.
For example:
When you connect your map to a datasource, have a custom column for color (Hex).
We'd use it for a quick reference when viewing our field operators and to have them separated based on route/job type or by shift time (starting = green, middle of shift = yellow, ending = orange) or if they report to different supervisors or zones, etc...
This feature is now available. The Locations(pins) dataset property has a color column which respects hexcode, RGBA, color names, etc which will change the pin color.