Indeed, I was going to say exactly this but I am glad I found your comment instead. The first question in the interview is about the reason good typesetting was

Indeed, I was going to say exactly this but I am glad I found your comment instead. The first question in the interview is about the reason good typesetting was important to Knuth and the .pdf sort of answers it. It is an excellent read but a bit painful to look at. Proper typesetting of TeX and LaTeX would go a long way to alleviate that, not to mention jagged vertical spacing in the titles and elsewhere.