Not sure which you mean. I have a 3200x1800 13" display + Firefox and the practicaltypography font looks amazing. I basically had to read the whole article just because of the joy of the typography. Medium looks washed out in comparison.
That answers my question then - on the 1440x900 13" MBAir, the black lettering from Practical Typography is jarring, and unpleasant to read for long periods of time for me, but Medium flows very well - and I read tons of material on their site.
PT is just very unwelcoming for me to read - both the diamonds all over the place (which reminds me of the PCL printout when you didn't have the correct font installed), and the assault on my eyes. Perhaps on a higher-resolution retina display it works out better (and perhaps Medium suffers somewhat in comparison)
I'm on a few-years-old Lenovo laptop with an ordinary 1366x768 display, and it looks fine to me. What browser are you using? Can you take a screenshot?
> basically had to read the whole article just because of the joy of the typography
I second this sentiment! He's a much better typographer than he is an author. An early paragraph reads, in full, "So, a few words about that." I also disagreed with all his points (e.g. I'd love to just type text as I'm doing into this comment field here with almost no formatting input choices, and get an article like his.) What he would call "eating out of the peanut butter jar".
The way he ended his essay was weak and not convincing. (I don't want to make money off of my writing directly.)
But the typesetting on his byline. Wow.
I was blown away by the typography and found it an absolute pleasure to read. I'd love to have my writing typeset as well. I read through his whole essay despite not agreeing with much (any) of the content.