Definitely. But I can understand why not everything is added yet: Addon configuration pages are mostly broken, downloads are broken, and some other APIs.

Once those are implemented, which is expected soon (only in october did they implement the majority of the APIs so far) all addons should work, and it'll be open again.

The big issue with just opening it now is that it'd lead to dozens of complaints due to broken addons, so I can easily understand limiting it to people with enough understanding to go through these steps.

Besides, the chromium workaround used to be the official installation instructions for AdNauseam for Chrome, until Google markef it as malware. And Chromium doesn't even support addons at all on mobile devices