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The 'best' mobile font is the one already on the visitors device so they don't have to wait for another to download...

Agree on that point. But wouldn't you find that boring if all the websites and apps had a single font?

Not necessarily. It's not uncommon (for myself) to disable styles to make the page load faster, or respond faster on my device.

Never thought of that. Should try it myself. Did you still like the UI after disabling styles? Won't that look a bit awkward?