Trouble is, people then get used to macOS’s font rendering, so that (a) they don’t want to turn it off, because it’s different from what they’re used to, and (b) start designing for it. I’m convinced this is a large part of the reason why people deploy so many websites with body text at weight 300 rather than 400, because macOS makes that tolerable because it makes it bolder. Meanwhile people using other operating systems that obey what the font said are left with unpleasantly thin text.
