I don't feel this is an imposition on others. I think it's the opposite. It enhances signal by reducing nitpicking, spelling/grammar errors that might muddle intent, and reminds me of proper sentence structure.
Many of us are guilty of run-ons, fragments, overly large blocks of text[1] because it's closer to how people often converse, verbally. Posts on the internet are not casual conversation between humans. They are exchanges of ideas.
[1] This is a classic example where I had to go back and edit it to ensure it was readable. As you do self-review with any commit ^^