Why do you insist on only using the middle third of my screen to display content? I'm over 50 and my eyes are not quite what they used to be. Your 12pt (ish) text is largely legible to me but why do you insist on your idea of presentation, rather than mine? The whole point of the www as far as I recall is that you send a message and I receive it. How it is formatted should largely be a matter for the recipient, with…
- everybody limits it. This is because no matter the size of your screen, the human eyes are somewhat limited to lines of 70-130 characters. Higher than that, and your eyes have hard time finding the next line at the end of the previous one because the travel is too high. As a web page writer, you need to take care of that, because the default presentation will be bad for everyone if you don't.
- as it happens, the author uses Subtrack so they might not even have picked that size consciously.
- reader mode works on this page, so you can use this to read the post the way you want, and if you like the content and would like to read it regularly, there is an RSS feed that you can use with a client that displays posts the way you want.
The last point is why separate style sheets and correctly structured content are so nice: if you have such a strong opinion, you can tweak stuff or even ignore the style sheet and use yours. And reader mode actually makes that practical for most blog posts / articles.
(that said, I agree that the width seems particularly small, I replaced it with 80ex just to try and it looked better to me - but I just set up a new WordPress website and the default 2025 theme has the same ~730px width for the content, I don't know what's with this default size)