I thought ISS taught you only how to underline titles and number paragraphs. A competent level in English, as with Maths, was expected on joining.
I resent having to pick up poorly written prose as much as I resent receiving it - catch 22. I agree that content is far more important than the layout and I get just as annoyed by peeps who push out a correctly formatted, smart document, on time, then spend the next few days amending the content! However, if the content is lost due to some imaginative punctuation and confusing sentence structure, it is all wasted.
It boils down to this: Why take pride in what you write and not how you write it? Do you have pride in what you fly, but not how you fly it? Like most things in the service, English (or people's approach to it) gets knocked most by those who have to excuse their inabilities.
Happy Christmas