Judging from the kind of content creators nebula hosts I'd imagine they do in fact have the kind of nerdy audience that notices miniature font differences.

In some ways I feel that caring a lot about fonts is on the opposite side of the spectrum to whatever it is making a population feel their lives have more meaning during wartime or crisis.

As a visual designer, sure, it is you job. As a computer user whose ultimate goal of using a computer is something else... I am kind of an old fart, but I often find that the best content is often found in conjunction with "font-family: sans-serif".

As an example, Tantacrul made a video about developing a sheet music font for Musescore (https://www.youtube.com/watch?v=XGo4PJd1lng)