wind does not affect lift....what makes a wind shear so dangerous is that: as you approach the shear, you have an apparent increase in airspeed. The pilot will then lift the nose and pull power off as the aircraft gets deeper into the shear with less power and higher than normal aoa suddendly you have a down draft, you're already low and slow you drop the nose and apply power but you just don't have enough room to get back to where you should be with the proper attitude and power. wind did not effect lift at all.
the other day i was coming back from Mexico, wind was 85 deg off the nose made an eastward turn and now I have a tail wind airspeed did not increase ground speed did though and the aircraft did not pitch up or down with the change in wind direction.
If your theory was correct as an aircraft turned into the wind the aircraft would pitch up, as you turn down wind you'd pitch down.
The reason an aircraft carrier turns into the wind for launch is to create airflow over the wings or airspeed.
Its not unusal to have 100 mph winds at altitude if for some reason the winds change or suddendly decrease the aircraft doesn't pitch down