I'm not bothered by Google, Apple's, or MS' decision, really. It's just that answering "Can you run Firefox on ChromeOS" with "You can run Firefox on a Chromebook... if you run Ubuntu" just doesn't help anyone that actually wants to run ChromeOS.
Also, I'm aware that it's just flipping the switch. It's not, for example, the same steps you need to do to root a Kindle Fire, but it's still the same result: You still need root access to install(and possibly run) Firefox with ChromeOS.