I've mentioned something similar elsewhere in this thread, but I really don't see why someone would choose Linux if their daily work revolved around marking up

I've mentioned something similar elsewhere in this thread, but I really don't see why someone would choose Linux if their daily work revolved around marking up PDFs, editing Office documents and sending email. I do these things on occasion (maybe once a quarter). When the time comes I drop the file on a suitable machine, do the work there, and get back to my real job (writing software that runs on Linux). Conversely, if I was still developing iOS software, I would not insist on using a Linux or Microsoft machine. It's just not practical. I get that people think the PDF/Office/Email should be on-par with Apple/Microsoft on Linux...but they're just not. I wish they were too, but I'm not going to spend my time making a Preview quality Linux app. These are objectively hard things to do. Most folks developing for Linux have other priorities.