If a wing/aeroplane "doesn't care about the moving air mass" Why is windshear a big deal?
Could it be that a parcel of air could change its speed or direction faster than a heavy aeroplane can? Does a sailboat instantly travel at the same speed of every wind-gust? Would a light sailboat adopt ambient wind conditions faster than a heavy sailboat? Does a sailor or balloon pilot never feel the "wind in their hair"? (Gust in their hair)