Earlier quoted context omitted.
> create an "optimal" language (ie, glyphs only trace to possible human vocalization There comes Chinese characters, which are exactly the opposite of your definition of "optimal": Chinese characters are not an alphabet, they do not carry phonetics, they carry meaning. And, guess what, this is arguably better. Why? Because phonetics tend to shift quickly. In a few decennies any spoken language has shifted, vocalisati…
Chinese is an isolating language, so it doesn't have affixes, conjugation etc. so they can use that kind of writing system. In the other hand, English and lots of other languages (including my native language Turkish) are synthetic languages, so they have affixes, and they do not adapt well to logographic writing systems (class of Chinese characters) in my opinion (I am not an expert on linguistics). My reasoning is…
But that need to memorize IS a cognitive overhead that is hard to dismiss. The Japanese have to learn thousands of Kanji from their early years (of elementary school) till well into high-school! And I would say that the encoding/decoding is actually an overhead only until it gets automatized in subconscious mind.