I guess this is a matter of interpretation. My read is that they simply show accurate line wait expectancy, thus ensuring that all lines are utilized (as oppos

I guess this is a matter of interpretation. My read is that they simply show accurate line wait expectancy, thus ensuring that all lines are utilized (as opposed to one line being empty and the other having a 10 minute wait). From a business perspective it's much simpler for an airport / TSA to put same staff numbers across and expect passengers to figure out optimal route, as opposed to making staff move around.