I am not agree with you!) 
Say you want draw a rosace 
You have the circle 
Start Arc from anyway on the circle 
On = center of the circle 
End = somewhere you want on the oposite side folowing on the circle  and inspiration 
due the design wished : can moving "end" on the circle is an help for the eyes! 
So for me Arc 3 points by Start On End is a good thing :)
 
Maybe Michael can make 2 variantes: one for you, one for moi (me in french) :)
 
And can move these "3 points" a big help also! (before "validate" Arc function) 
(idem for the "3 points" of a circle)
   
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Pilou 
Is beautiful that please without concept!
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