[gumby]

Why fetishize uniformity in the name of some absurd "efficiency"?

People are all different and why should they not choose to communicate/eat/enjoy themselves as they wish, with all the advantages and disadvantages of their choices?

(Plus in the case of languages there are things which can be said in some and really can't be said in others. My wife, child and I would typically speak multiple languages, sometimes even in the same sentence, in order to convey the nuance of what we wanted to say. Hell, even in English there are things said in discipline-specific jargons that aren't really communicable any other way).