I remember when I first started learning German, I thought it was useless. But after getting used to it, when I switched back to English, I was like where are all the nouns? Why is everything lowercase? It's all about what you get used to, I guess.
Furthermore, said symbols must convey previously unknown information - which this rule does not, as the nouns have the same meaning whether capitalized as not, and the "information" conveyed is redundant.