This is an opinion of mine. It is one that I value.
One must work on their language every day. It shouldn't be taken for granted. I've always held this opinion simply because my maternal grandmother and my mother each had a command of the English language, written and verbal, that I have admired and respected. Luckily for me, I love dictionaries and like to find words to learn and understand. As far as punctuation and typos, I think we have to work with those as well. There is a reason to proof your work, then proof again, then proof again. Something along the lines of - constant vigilance -

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Excellence is contagious. ~ Andy Baker, President, AndyMark, Inc. and Woodie Flowers Award 2003
Character cannot be developed in ease and quiet. Only through experience of trial and suffering can the soul be strengthened, ambition inspired, and success achieved.
~ Helen Keller (1880-1968)