[aclimatt]

I'd say that actually is my point though. If you're a high-ranking official giving a speech, speaking the same language as the general population will make you well-received and well-understood by using the language of your constituents.

Speaking a language people understand is decisively a good thing, and what people understand varies dramatically by situation. "Plain English" isn't always the answer. (Also hierarchy -- when you're on top, you get to set the tone.)

If you want to be part of a club, you need to sound like a member. Unless you own the club.

[nicbou]

In the end, you have to adapt your speech to your audience. If you address the members of a club, you can speak their language. When the club is 300+ million strong, you might have to pick a broader tone.

[noisy_boy]

Your last line beautifully captures your point. Very well made.