I agree that you and I and plenty of other people bought Cosmo or Gemini because they thought that Planet Computer is actually developing and providing us with other versions other OS's to use. But that is different from what Planet actually does. That is point I'm making.
In other words, it is clear there is a disconnect between what we as users think and what Planet thinks/does......unfortunately, this becomes clear to us users after we purchase our devices....
As for your SF browser issue, unfortunately, not something I can assist with....maybe Varti or speculatrix can....
Also bought it to run Sailfish in the end and to replace my old N900. Debian will most probably not be usable for the phone use case, I suspect. Well, but knowing the timelines of the Gemini it has been clear that there won't be a Sailfish port in the beginning. At least for Gemini users this should not have been a surprise. We'll have to wait and to do parts on our own to get it running. Well, and to be honest, Planet never have promised more than that.
Hoping to get at least a Lineage OS within reasonable time, to be able to start using the Cosmo as a ((nearly)Google free) phone. Later on switching to Sailfish might be possible.
Anyways, has anybody seen the CODI interface parts needed for the port?