When a map is created with multiple setups it would be nice to know which one is being used.
For example I had a game a while back on World of Midgard that was a 2x2 set up by a member of the other team.
We started with Blue/Black starts.
But if you check the map editor there are two options where one team gets these starts:
blue/black vs white/red
or
blue/black vs red/green
So since our opponents knew which version is chosen they know our starting cities from the start while we know one of their cities and the other could be one of the remaining two.
That gives away a bit of an advantage to them.