Not sure why anyone would want to specify a font for content like a blog. To think your taste is more important than peoples preferences and settings seems incredibly self centered, or dare I say narcissistic.
So I use two weights (regular and bold), each weighing in at 30kb, woff2 only, preloaded in the HTML and served with long-life cache headers. I know that some users have turned off web fonts, but they've chosen that pain. For the other 99%, I just want my blog to look decent.
Then why do designers have them? One would hope browser vendors would select and ship a good set of default fonts, but I suppose that's not the case.