I'm not sure what you mean by uptime measured in hours, it seemed fine to me in the years where I used it.. It also provides all of the common computing including all of the browser debuggers, etc, the state of common computing might not be that impressive but that is Windows, OSX and Linux' fault.

One could argue that anything you can't do on a ChromeOS machine (or an equivalent Firefox one if that project were more complete) without running a VM is proprietary garbage. The other Apps you will run will work on some percentage of machines, the device you use have incomplete drivers, the window environments they developed for were not worth standardizing such that a browser has to provide the standards layer.