> It doesn't really make sense to optimize for screen space like this.
However, the teaching style along with a symbol alphabet that IS trying to solve for better legibility ...
Optimizing for legibility as opposed to screen space is a distinction that isn't very meaningful in practice. Because if words aren't legible enough, people increase the font size until they are. If something is extremely legible (like latin letters at a 40pt font size) people will naturally tend to decrease the size. So screen space and legibility are largely different labels for the same concept. With some wiggle room but not that much.
Optimizing for legibility as opposed to screen space is a distinction that isn't very meaningful in practice. Because if words aren't legible enough, people increase the font size until they are. If something is extremely legible (like latin letters at a 40pt font size) people will naturally tend to decrease the size. So screen space and legibility are largely different labels for the same concept. With some wiggle room but not that much.