No one thinks major repairs should be added, and no one thinks we should land, taxi, and have a brand new plane.
I agree that things like ailerons, flaps, elevators, and rudder should be fixable because they DO affect your plane. Something like taxiing to a hanger, waiting for some amount of time, RELATIVE to the ingame clock, so you wait 3ish minutes or less, and getting back into the air sounds like a good idea.
however, those replacment parts acting differently sounds odd why not tower out if performance will suffer?
i suggest starting with basic control surface repairs only in a hanger and working from there.
also, is it really that different from running out of fuel or ammo and resupplying?