10pt font is just bad because there are too many combinations of device/person where it's nearly illegible. It's fine for fine print and redundant captions but

10pt font is just bad because there are too many combinations of device/person where it's nearly illegible. It's fine for fine print and redundant captions but you shouldn't go below 11 for paragraphs in most cases. Also, even if you're an information density nerd you need tactical whitespace that helps you quickly jump to the right text box.