Gasax
I take your point but the same principals hold good albeit on a much lower scale with light aircraft.
I would much rather carry speed in hand in such conditions and get rid of the speed when I know I am in much more stable air nearer the ground.
I can use the energy available from that extra speed if need be. No extra speed and I only have my engines to save me. If you have experienced half serious windshear you will know you wont want to rely on the engine alone especially when you are thrown onto the back of the drag curve by the shear and lack of speed
Pace