Out of curiosity. What's the minimum grid size someone has created a readable font for? This is pretty nice at 5x7, but how low can we go?
https://graphicdesign.stackexchange.com/a/91523
Below that, things get a little weird, e.g., https://github.com/Michaelangel007/nanofont3x4.
If you’re allowed to use LCD sub pixels, you can make a 1x5 font!