[dathinab]

It's text size 14px + a relative thin font + font with "serifs" + #404040; instead of black. Which is a gray which looks black but is 25% white.

I.e. thin small text of a font type which is well known to yield less good results on screens with unnecessary low contrast == bad UX.

Sadly way to many people today assume in their choices (sometimes without realizing it) everyone has mac book level HiRes OLED display and good eye sight where this should still looks quite fine (the contrast is better due to the screen, the font might lock wider due not using traditional sub pixel anti-aliasing, and the serifs aspect is less "bad" on high resolution displays).

But if you display it on a 1080p ISP display (assuming it's a decent 1080p ISP display) it will not be a very pleasant experience in a very subtle way due to lower contrast potentially thinner text and serifs in generally leading to decreased readability on non HiRes screens (hence why for years the general recommendation was not to use them for digital content).