Most websites still don't behave well if I increase my browser's minimum font size to something I'm comfortable with, like 16 or 18pt. Entire or partial blocks

Most websites still don't behave well if I increase my browser's minimum font size to something I'm comfortable with, like 16 or 18pt. Entire or partial blocks of content will disappear, links will become unclickable, paragraphs will overlap. For all the efforts in the past decade for increasing accessibility, this very simple scenario is somehow still beyond reach.