I can verify this with the story of my Ace Seamaster.

Many years ago, I built one after seeing what a nice seaplane it was. I didn't like the cardboard tube they used as a leading edge, so I cut a foam wing and "just for looks", gave it a sharper leading edge than the original.

After two seasons of adjusting weights and balances to try to get the thing to land properly, I heard about the "sharp vs. blunt" leading edge thing. I then cut off the sharp leading edge, and added a rounded one, and the plane has been flying great ever since!