In my opinion very few if any sites need fonts. The user has a default font, who am I to say that I know a better one? If you want to be more pragmatic you ca

In my opinion very few if any sites need fonts. The user has a default font, who am I to say that I know a better one? If you want to be more pragmatic you can accept that most browsers use awful fonts by default. However coming soon is system-ui, ui-serif and ui-sans-serif which allow you to let the user to continue picking the font, expect not awful. (I still don't understand why browser didn't just update initial, serif and sans-serif to be non-awful, but I'm not a browser maker)