Since our designers use the language of pixels and we have the time to develop different breakpoints thoroughly, we tend to use that as well in our code. But I

Since our designers use the language of pixels and we have the time to develop different breakpoints thoroughly, we tend to use that as well in our code. But I get a lot of value out of using ems in more local styles, in situations where I know the font size will be changing and I want certain things to scale with it. One easy example is line-height on headings; font-size will change between breakpoints but you can usually pick a line-height so that you don't have to redefine that every time. Same with letter-spacing. As to the accessibility concern - I've read it, but I've never been dinged on an audit for it. That's not some kind of conclusive non-happening because audits have problems of their own, but...I don't know, I guess I'd be interested in people talking about their experiences here, if they've had real-world situations where rems made things better for disabled users.