I should note I am no expert on anything of this, I have a Chromebook as a sort of backup/alternative. FlipC434
Developer mode basically unlocks the r/w firmware, so you can boot from USB and replace the firmware etc, but the Read-only Google Root of Trust stays there, however as far as I know the ChromeOS 'distro' exists only to support running the Chrome Web Browser, and also Android and Linux VMs, +audio/video/input/etc. So if you have root on a ChromeOS device in developer mode, and you are dropped into a shell and want to run firefox, how would you do that?
There are no packages for running on 'ChromeOS'. You can't just apt-get. I don't know if ChromeOS is self-hosted, ie. it is compiled and generated on itself and not some other Linux distro.
which
I don't think adopting Wayland or using the 'Linux' Chrome makes it move towards being a 'general purpose' distro. This just lessens the amount of change between ChromeOS and Linux so no more Freon library. It also seems to greatly reduce the difference between the CHROME_BROWSER_FOR_CHROMEOS and THE_CHROME_BROWSER_FOR_LINUX builds.