As I recall, Kodachrome was different, in that it was developed more like black and white film, and the color dyes were added during processing. This is why Kodachrome could not be developed by home processors, and it’s also why properly stored Kodachromes (save for the first couple of years from the 1930s, where the dyes have decomposed and the images have become mostly black-and-white) have held their colors well for decades.
You are correct sir.
Now it is possible to do color developing at home using the c41 process.
It is shame so much of the photo world is just going away. So much progress in relatively little time.