I mentioned above that I think Caret is a great Sublime clone, but I also like having the real SublimeText, with its awesome add-on packages, Git integration, etc. The article's recommendation that you must stick with Android-enabled Chromebooks limits your options, and the only reason the recommendation exists is that he needs some way of getting access to the developer tools--gcc, etc. A crouton chroot gets you there the same way, and I'd argue it's better since the programs are running natively rather than through an emulated Android layer.
Maybe a separate Linux install such as GalliumOS can really be called full access Linux environment?
Been a few years since I used a chromebook w/crouton, but that wasn't my recollection. In fact I recall a fork of crouton that supported Fedora explicitly stating that it installs via docker.