It is easier to steer and to maneuver. To turn, you simply take a longer stroke on one side. You can stroke forward on one side and backward on the other and turn around in your own boat length. You have better control in the wind. One person sitting low gives less windage than two people sitting high.
Power is applied to both sides, and farther out, so correction is easier.
It is more seaworthy. You can row with your feet, freeing your hands for other things like taking pictures. A boat that I can launch and row by myself. A boat that is fast and responsive enough to be interesting. A boat that is stable enough to relax in.