I confirmed the letter spacing is still an issue by comparing the "How I digitize books" paragraph on Chrome and FF. I had to override the CSS as the site has switched to "Newsreader, serif".
I don't see the fonts appearing bolder difference (on my 4k screen). Actually that's not true, I have seen differences on lower DPI displays. I get around that using BetterDisplay to enable HiDPI on the external. I've also never noticed San Francisco font rendering improperly which I only would if it didn't fit in a clipped box.
Now that performance is largely improved, maybe they'll get around to fixing this one.
I don't see the fonts appearing bolder difference (on my 4k screen). Actually that's not true, I have seen differences on lower DPI displays. I get around that using BetterDisplay to enable HiDPI on the external. I've also never noticed San Francisco font rendering improperly which I only would if it didn't fit in a clipped box.
Now that performance is largely improved, maybe they'll get around to fixing this one.