Dark mode is popular, but not always a critical feature. Users behave similarly without it. They think about it at the system level, not the application level.
When choosing typography to use in designs, narrow down your options by understanding the most common classifications, looking for typefaces with multiple variations and distinct characters, and pairing typefaces together with consistency and readability in mind.
Among high-legibility fonts, a study found 35% difference in reading speeds between the best and the worst. People read 11% slower for every 20 years they age.