A few things I'll comment on all at once.
I'm probably guilty of not being understandable at times. I tend to be a bit long winded.
Evilking- I do nearly everything with attention to detail. That probably comes from training in machining/drafting, and doing jobs where missing the details had a possibility of getting someone killed or injured.
Ain't...........I have never figured out what it's supposed to be a contraction of.
While I'm not great at grammar the thing I've seen recently that bugs me is mixing tenses. As in "This bike Needs restored"
I've been told this is really common around Pittsburg.
By the time I was in high school I liked rules. Especially ones I could turn to my own purposes. Our school handbook specified "a note from home" was needed to excuse an absence. So I had my sister write one when I skipped school.
Dad was less than pleased since he'd written the handbook. I had to help rewrite it over the summer.
I don't think much proofreading happens, even at places where the business is writing. Like the newspaper. So many articles have errors of spelling, or the wrong word used, or stuff that takes a few minutes to make sense.
Steve B