Well, firstly, airborne aircraft modify inertia, they don't have anything else to react on except compressable air. You can extend a literal barndoor, but the reaction to that is still relatively slow even if you can fling a highly reinforced large door open really fast. Watch the tailfeathers of a commercial airliner on a gusty crosswind landing, they are moving lots for not much attitude change.
Julians comment was flying on a road with reduced downforce was similair to driving on an icy surface. I concur having driven a oval race on a frozen river, or doing intentionally stupid things on an ice covered parking lot. If you reduce your ability to alter direction, then your learned ability to fix that situation becomes useless until you relearn your required response. Being 3/8 of a second in the past in a semi flying car, when that deer shows up, you have this really big problem really fast to fix with possibly learned erroneous solutions in a slowly responding vehicle
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