So I believe what the gentleman said about making some subsection more ridged shifts loads elsewherrthat would have been taken up in flexation away from the flexed area and moves them to some other portion of the structure.
I used to own a cessna 172. Great airplane. My first owned airworthy airplane. I was afraid to lean on it for fear of denting it, the stressed skin was soooo thin. None ever broke apart as far as I know, it just seemed SO soft. It was a 1966 model and because they are so numerous and popular I assumed they must be 'the thing' to copy. I never found any loose or smoking rivets. Somehow I had imagined all aluminum general aviation planes woild be like that. I was wrong. I later bought a Lake LA-4 (who wouldn't want a 4 seat flying jet ski?), which I found the skins are Thick and Hard. Like if you punch it your gonna hurt your hand. Hard, Stiff, Unbreakable, built like a tank. Smoking rivets? Everywhere! All over the damn place! And many have clearly been replaced many times already! So yeah, I believe it: make it harder, stiffer that load will go somewhere else and change the conditions at that new location.
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