Not the author, but my issue with Hugo is that the template language is so different from everything else I've ever used that it didn't feel worth the effort to learn (and, later, re-learn) it, when I could just find a different static site generator with a more agreeable template language.
Note: this only applies if you're planning to write your own HTML. If you're using a packaged theme, Hugo would likely be a great choice. I didn't want to use an existing theme, because all the ones I found either didn't do what I wanted or were bloated (or they had Facebook and Twitter logos built in...). For the record, my entire index page (including CSS and favicon) is 1/5th the size of just the CSS used in Hugo's tutorial.
Note: this only applies if you're planning to write your own HTML. If you're using a packaged theme, Hugo would likely be a great choice. I didn't want to use an existing theme, because all the ones I found either didn't do what I wanted or were bloated (or they had Facebook and Twitter logos built in...). For the record, my entire index page (including CSS and favicon) is 1/5th the size of just the CSS used in Hugo's tutorial.