I wonder why light/dark themes became the norm in a couple of years, but we are still begging for the wide/narrow themes or two or three themes with different font sizes. Those would be very useful as well. And I'm as guilty as the next dev of course.

Yes you can already resize the window or zoom but that oftentimes break the design in some way.

Well, nothing happen in tech before it's a trend, so let's just wait and hope.