Kodachrome was what you had for colour transparencies in the US, because Agfachrome was either not around yet, not available because of the war, not being imported, or not being processable in standardized chemistry (which also didn't exist). Its flaws typify the aesthetic of an era demarcated by said conditions. As such, Americans nostalgic for the rough WW2 era, which is like all of them, think they love Kodachrome's colours.
In actuality, Kodachrome's colours were defined by its technology, which took enormous expense of Kodak to develop in the first place. So they stuck around for so long that Kodak was kinda late for the train on their own E-6 chromes.
Consider why there are so few good film sims of Kodachrome. It's not the colours: it's the olden vibes that Americans get. The colours are replicable, but no-one likes the result like they do the real thing.
