Yes I get the point of the theoretical exercise of joint busting aside from it being a lot of fun in some way perhaps. Soort of like, nobody actually wears that crazy Paris cat-walk kind of clothing. But belt and suspenders? I could never really get my head around that one, still can't. It's why you have pocket-knives, for those times when your outfit includes over-all or suspenders and you leave your fixed knife or your multi-tool in its belt holder on the bureau.
I look at the joints cross adaptation. Could it be that it began as a remedy addressing something very specific like the various forces exerted on a particular component of a horse driven mill in and around the late middle-ages, and from there just got taken into the barns that got built. Today we still got barns but no more horse driven grinding mills, well, an acquaintance is building his but this is an exception.