So we agree then.
>but it's very efficient to simply use the right "I" to convey the right meaning.
How do you quantify efficiency here? Having more generic words can arguably be more efficient in situations where you don't actually care about which "I" you want to communicate: "I want an ice cream Sunday please". Besides some languages (and I believe Japanese to be one of them) are pro-drop and let you drop the pronouns in most cases, isn't that even more efficienter?
My native language is French, which unlike English kept the T/V (thou/you) nuance. You have familiar you and polite you. Do you consider that more efficient? Because as somebody who's usually pretty shy I've often found myself in awkward social situations where I simply want to say "how are you?" and "vous" feels too formal but at the same time I worry that "tu" might be a bit too brash and quite frankly I'd gladly trade them for a generic, neutral English-style "you" in situations like these.
Some other romance languages, like Brazilian Portuguese for instance, almost completely dropped the T/V distinction. Are they becoming less efficient or more?