The conventions for formal messaging and informal messaging are different, and punctuation is a contextual marker for formality. Receiving a reply to a physical

The conventions for formal messaging and informal messaging are different, and punctuation is a contextual marker for formality. Receiving a reply to a physical letter that read, on company letterhead and with a physical signature Taxcoder, regarding your proposed changes, Ok. Sincerely, Jim Bossman would be a bit alarming, because it's clear that the letter is a very formal one, but it deliberately omits everything you'd normally put in a letter. If you instead found your proposal mailed back to you with OK - Jim Bossman written on the bottom in red pen, you wouldn't be at all worried, although depending on the context you might be insulted by the informality. I think if a message without punctuation seems sloppy, the situation is formal enough to write a full sentence or paragraph. The combination of little to no feedback and attention to detail is what worries people.