Interesting point about reflowing text: Why don't browsers reflow text on mobile when zooming the same way they do on the desktop? This is a mayor annoyance for me since, well, forever. As a visually impaired user, forcing me to swipe text left to right the whole time after I zoomed to a comfortable font size makes reading on smaller screens really bad.

And before you mention it, changing default font size in browser/OS doesn't really help, mostly makes things worse (Bad categories like "medium", "huge" instead of font size, page layouts breaking etc.)