True, and it will also "buckle" a lot more, because the camber gives you not only lift, but also a lot more pitching moment (Cm), so more difficult to control, needs a bigger stab.
Another disadvantage about E387 is the superthin trailing edge, VERY difficult to produce and avoid damage.
It is the almost perfect profile for max lift AND low drag - really efficient.
But drag doubles when you reach Ca = 0 (high speed).
Does not mean you can not ride 18 knots only, bohme meant it has its lowest drag at a high lift coefficient corresponding to 18 knots speed approximately.
And when you go at lower angle of attacks (on the way to faster) you need more kitepower as the drag increases a lot more than less cambered wings.
The Naca 4 series are low camber and will have low drag at high speed (low Ca = low AOA) and be a lot more stable also.
So for an allround foil in waves I agree, it will work better.
The E387 will be one of the best regarding early foiling and awesome upwind angles, by far the best L/D ratio.
But too difficult for practical use probably, and too high drag at high speeds, I agree after having thought it through