Not true. Only request that are denied due to illegalities have to checked by a human. Example. There are 400 request, the system gets through 5 and the next is denied due to not enough rest between pairings. A human, and yes just one human working all the bases FCFS that day and also dealing with real time issues has to look at it. It pauses the system and does not unpause it until he clears it. Then 5 request later another illegal request. Sometimes it just sits there for a long time on pause. They could get more than one guy, and pilots could also stop making request that they know are illegal.