Don't know why it should bother you -
I aways felt that the wing shape/foil etc., should be whatever is best for a particular application.
THIS application fits perfectly.
We have sanded the edges round - just to se what effects there are and honestly I cannot find any differences -other than time spent.
Your point of getting things accurate - is a real pet subject for me
Years ago I abandoned the constnt curve in airfoils for models
Why?
One simply can not get left and right panels exactly the same - So I opted for a smooth LE -which blends into the high point of the foil then blends to a straight line to the TE.
These are easy to buildaccurately and tho it may sem clumsy to you - It really should not as they work extremely well .
There are a hell of a lot of international /national / regional trophies awarded on models using that setup .
I know George Hicks and he is in my opinion , very good at his theory.