Great thread, azdr!
I employed interns for many years. About 10-15 years ago, I stopped hiring them. I could no longer deal with the semi-illiteracy of graduate students! All of them were graduate students at well-known universities. I marveled how they could advance so far academically but were not capable of basic composition. Very few were able to do the technical writing I needed. Occasionally, one of them would give me an academic paper to proof and/or comment. Most of them were difficult to read, marred by poor grammar and sentence construction. I was honest and usually hurt their feelings with my comments.
I retired many years ago, but I recently accepted a temporary job for which I have to read, evaluate, and produce technical documents. I had to revive my own skills after years of dormancy. I enjoy the mental stimulation.
P.S. Composition, sentence structure, and grammar tips are all welcome! 😋