Sorry about that.

> and GP was presumably referring to things like headings being larger, not some subtle differences that dyslexic people would miss.

I was imagining bold or italics, both of which are easily missed by people who are dyslectic, or using different type faces, which can trip them up. Headings can help, if the text and spacing is suitably big, but I'm not sure what situations that can help much with in typical usage. I'm having a hard time thinking of examples where I would do that beyond what's already common.

> Why?

Easier to recognise as what it's supposed to be and easier to distinguish from other icons. More distinct traits in icons help you recognise something for what it is more quickly.