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I like to think of myself as a power user who has spent considerable amount of time deciding which fonts I like as my serif/sans/mono fonts of choice and customizing them. I like seeing them when I'm reading stuff. Google does the right thing, not assuming a local font!
I hate it when some websites tell me which local font would work for me better. I can see if they're using a fancy font and loading from web but on my computer, I know better.
Why not just specify the family and be done?