"But OP isn't suggesting preamble is unpleasant, they are saying there is little or even no value and to remove it altogether."

I'm not sure about this. OP said:

"When you ... [SNIP] ... you are making the recipient wade through noise to get to signal."

So it seems like OP wants other people to:

- not waste their time and energy, but

- is happy to take any emotional cost that comes with that.