Hi oldnek , aviation coatings I find tend to apply easier ,better build and coverage holds a shine longer because of higher uv tolerance, and it touches up without repair edge frying and dramas and that's the main reason, I sometimes see these cars for minor repairs twice a year, so a cover my backside on re-repairs.
Also to a point i'll paint your car in any quality paint you want, these guys think it's better and specify the quality, some rally cars I do I wouldn't paint gates with the crap paint I use on them but after a race season the bodies are so damaged and there's no paint on them anyway