Side note: I love the imperfect fonts and old school design of the website. For years I've been looking for ways to re-create old book style text and graphs in the digital era. This gets so close to that vision.
These are great, but the effect breaks down with digital fonts since every glyph instance is the same. There would have to be slight variations of each, and other imperfections caused by a typewriter or printing process.
I'm not sure I like the effect of the font in the article. The subtle vertical position differences and inconsistent kerning are distracting. Typewriters and physical printing are not sloppy in that sense.
I've written and typeset books. It's not so much that there's no "fl" ligature: it's that with that font the lack of a "fl" ligature really makes it bad looking. With many other fonts it wouldn't be anywhere near that bad (and I'm not just only about monospace).
