I'm not sure what that means. I think I know but I'm not going to assume.
What I do know is there are few things more fun in fishing than throwing big dries out of the front of the boat with someone who is dialed on the sticks. As the fisher, I don't want to have to direct the rower or tell him/her where to go, to slow down, to get closer, move away, etc. I just want to be able to fish and not have think about it.
Speed, distance, angle of the boat, being able to make micro adjustments without disturbing the drift, reading the water anticipating what the angler should be fishing next so you aren't "behind," all these things come into play. Then add wind and it makes it even more difficult.
Anyone can row a boat down a river. Rowing for a fisher is a completely different skill set. And when you have a skilled rower with a stick in the front of the boat, watch out.