I don't know about postwar planes, but at least some of the WWII war birds had notoriously poor seat adjustments. For example BF-109 had a seat that doubled as

I don't know about postwar planes, but at least some of the WWII war birds had notoriously poor seat adjustments. For example BF-109 had a seat that doubled as armored fuel tank. It's bit tricky to add adjustments to such heavy piece of furniture, so they didn't. The thing here, just like you pointed out, is not to tailor the seat for average nor individual, but a range that suits most individuals.