That's an interesting point. As impressed as I am with codio's technology, I'm wondering what the use-case is. People who need to do lots of dev, but on a different laptop every day? Maybe developers who aren't allowed to go through a US border check with a company laptop? (although such developers would be unlikely to trust a cloud IDE, at that point...)
There are a lot of advantages to coding in your browser. You mentioned just one of them. But primarily it means you have no stack to install and configure, as Codio Boxes provide all that for you. Also, you will find that server development is much faster, as the connection between Codio Boxes and the internet is much faster than that of your desktop.
Other advantages include collaboration, teaching/learning, and of course no need to install or keep anything updated on your desktop - other than your browser of course.
I don't trust enough the company yet to just send some of my github details.
And then I'm just not ready to pay for an IDE, I work mostly from my home office, I don't actually need to pay for an IDE, Netbeans works perfectly.