It's more a matter of commerce. Ultramarine, and cobalt blue came along later, in the middle ages; the ancient Greeks and Romans had few and poor options to fo

It's more a matter of commerce. Ultramarine, and cobalt blue came along later, in the middle ages; the ancient Greeks and Romans had few and poor options to for creating blue dye, or tiles, or paint. So it just wasn't seen much, and there's no need to invent a word to say the sky is blue when you can say it's "a clear sky." This probably did affect perceptive abilities to at least some degree - we do lose the ability to hear and distinguish phonemes we don't hear when quite young, but that's a much more extreme case.