A fantastic deep dive into what default settings "should" be for true fluid typography.
I really appreciate the crux of the article:
For now, I like that we’ve put the focus on what an
emrepresents to the user, rather than how anemwill render under default conditions. We’re not trying to achieve a specific font size (or range of sizes) by assuming the user has a16pxdefault. There’s no calculation witchcraft aimed at some target value in our designer mind, and the clamps are not related to my desired range of outcomes. Instead we’re adding a slight responsiveness to the user value, and using the clamps to keep our fluid value within range of the user’s intent.