I like to think I'm not too nitpicky about fonts, but that st ligature is incredibly distracting.
It's the second article I've seen here that uses it over the last few days, but I'm not sure if it's the same site or not.
In the modern age Latin script, the only acceptable ligature is "fi" in a proportional type, because the top curve of the F usually comes very close to the dot of the I already. For the rest, they're totally useless because we don't use moveable type anymore.
Well, I also tend to enjoy programming ligatures, such as != becoming ≠ or => becoming ⇒. (but in a size proportional to the pair of fixed width characters, see https://github.com/tonsky/FiraCode )
But then I don't inflict them on anyone but myself and people who look over my shoulder...