Sure, it's complex, but the basic point still stands. Most people will probably be able to accurately identify 10-20 different colours, if we fix the luminosity

Sure, it's complex, but the basic point still stands. Most people will probably be able to accurately identify 10-20 different colours, if we fix the luminosity etc and they are given cards with each colour. When it comes to sound though, even many musicians won't be able to find even a single absolute note, even if we fix the timbre, intensity etc. So colour and sound are definitely fundamentally different, which I don't find very surprising, there are few situations in the wild where it would help us to be able to distinguish absolute frequencies, timbre is more important.