Why is Chrome's English dictionary so bad?

Chrome's English dictionary always seemed weak to me. A valid word that's not found is just a little pin prick of annoying, not a big deal. But for the last few days I recorded correctly spelled legitimate words it didn't have, in Chrome for Windows 25.0.1364.172 m. And came up with 17 words: hypotheticals anonymizing dialogs compatibilism circularities homuncular squirrely nauseum vanishingly anthropomorphization unaffordable logarithmically relatable epistemological repurposes smidge relatedly Which is not a huge number, but these are not obscure chemical names or bizarre words, these are pretty normal. I put the words into Word 2010, it flagged 5 of them, so quite a bit better but not perfect. Then I put then into Google Docs, it correctly knew all of them. What gives? Why is Chrome's dictionary so weak? This sounds like typical whining and complaining about a detail of someone's product that is otherwise very good, which it is, but I also really just want to know why it's so bad? We won't judge, just tell us, let us learn from it. It's ironic since Google brags that spelling correction is a competitive advantage of theirs. Plus we're not even talking about correction here, we're talking about a list of words. Are they trying to save memory? Save money? What is the deal?