@Kristen M but I still see nothing about it that isn't safe or surefire. If it's known to not work in some way, we should file a bug with Marketo, not cast doubt on a feature we actually trust every day. Also, assuming a PDF is actually saved from that same web page, I don't see how that's easier to digest, or any less ugly; some computers even open PDFs in a separate reader app, which surely isn't easier.
That said, if View as Web Page created PDFs automatically I would probably take advantage of that option for very old emails because they seem more archive-y.