She has phrased this as a question, so here’s the answer: YES.
This is the answer Parker offers as well, thankfully.
Quality is in the details — and attention to commas, semicolons, dangling participles, gerunds and the proper placement of quotation marks says to the reader that this person is careful, considerate (because bad grammar is painful to the discerning eye), and (there’s that Oxford comma) competent.
“Grammar is credibility,” says Amanda Sturgill, an associate professor of communications at Elon University, where I recently spoke. “If you’re not taking care of the small things, people assume you’re not taking care of the big things.”