This is a post by Deckman about singing for other singers.
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I gather the frame of reference of this thread is Europe? All I can add is to speak from my own experiences here in the northwest corner of the U.S.

I've recently sung several concerts where there were many experienced singers in the audience. I was thrilled to see them from the stage. I was even more pleased to observe as they became a very, very good audience. They were watching, and listening very carefully. I could see as they took in the little nuances that only experienced stage performers notice. After these concerts, to a person they all made comments about the little things they'd picked up on.

Give me an audience of performers any day ....
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Some sentences are long, some are short, most are medium length.

Words are simple, but when he needs a technical term (nuances) he uses it.

Paragraphs are not too long. (I myself can't be bothered to read an Internet paragraph that's more than 4-5 lines long. Janie, you have some that are 7.)

He makes a point (good audience) and backs it up (watching, listening commenting later)

He wraps it up with a good punch line.