Can flaps be used to perform rotation and flare?
While this is an interesting idea, there are some key issues with it. As a GA pilot, here are my issues with that concept.

Changing flap settings causes signifigant differences in aircraft handling. If I was, say, on short final, and I changed my aircraft's configuration - it would be difficult to maintain a stable approach profile to the runway. If I were to deploy my flaps just above the runway, the aircraft would lose its &quot;stable approach&quot; and I would not have as much control authority over where, when, and how my aircraft touches down. There is a reason GA and Commercial pilots alike are taught to maintain a stable approach and have the aircraft fully configured well before landing.

I would never adjust flaps on take off or climb out (until at a reasonable altitude). The reason is simple. First of all, aircraft have operating limitations. You would not take off with full flaps because they generate too much drag, and hence limit aircraft performance. They are great for landing because of that same drag. However, If I were to take off with (theoretically) full flaps in a Cherokee or Cessna, it would not be safe to retract them until sufficient airspeed and altitude has been attained. Raising flaps at low airspeeds causes a noteworthy forward pitching motion and a temporary arrest of the climb rate. This is dangerous when in a low-airspeed, low-alitude situation and is warned against by CFIs.