Atkinson Hyperlegible as a default font for a WordPress theme
If I started to create a WordPress theme today, I would choose Atkinson Hyperlegible as the default font.
What makes it different from traditional typography design is that it focuses on letterform distinction to increase character recognition, ultimately improving readability.
I would put accessibility as the highest priority, and choosing a font that works well for most users is crucial.
To be fair, the only guarantee I have that the font functions well is that it comes from the Braille Institute of America; by any means, I'm not a typography expert.