I agree.

The problem is with the design. At our small scale it is hard to get the same benefits of a moderate cambered airfoil with flaps due to building problems. You'll get sharp edges and corners where a cambered airfoil would be smooth. There will be a difference. How big? Depends on the geometry. If it can be done it would work wonderfully. I'm sure that an airfoil with camber would do fairly well in this type of competition.

I read about a competition years ago. The planes were electric and they had to fly a course. The winner did use flaps for takeoff and landing.

I think one of the major things overlooked by the teams with flaps underestimated the pitching they would encounter with a high flap displacement. Pitch up, loose speed, stall and crash. I'm sure that they never loaded the plane to it's capacity before the competition.

Sometimes simplicity is the best policy. You might have enough drag with the flaps deployed to counteract the drag from the cambered airfoil later in flight. There are so many factors that it could be a Doctoral thesis to build this plane.

Thumbs, if you are crazy and want to try the airfoil, I have an Excel spreadsheet with plots to make the templates out of.