The point that english employs more polite words and phrases than many (most?) other languages is still valid tough.
I don't know, but I guess my follow-up question to your factual statement would be, "Do you have any examples attested by professional linguists who have carefully compared languages, or is this based on your personal experience?" The reason I would ask that way, which I hope doesn't sound impolite, is that my experience is to the contrary. I find English to be a rather informal language among the dozen or so languages I have studied most closely.