Research also shows that small boats teach technique the best, because of the direct feedback for the rowers. Sometimes, it does not even require the input of a coach that an athlete knows what has to be corrected. Small boat training improves the sensitivity of the rowers and often, a proper technique can be found simply through trial and error. A pair also shows very clearly the compatibility of two rowers. This knowledge is important for building larger crews.
Rowers learn to be only dependent on their own performance.
Consequently, they learn confidence in their own abilities. The individual performance is for every single stroke on the line. You simply cannot hide, but you learn to perform. It is much tougher to train and perform in a small boat, where your own performance has such a large influence and no coxswain is there to keep the spirit up. Training in small boats is also much more competitive.