How far are we from a phone that: ships fully formed - no flashing and stuff, has reliable supply chain and production, is open source only, usable on a daily basis (stable, normal battery life, all basic apps, easy upgrades) and ideally repairable / recyclable as much as possible? I would leave "high-end" specs and price constraints out of scope to make this a reality sooner than later. There are several contenders…
Far in never. There's no (real) money to be made, manufacturers don't care. I use GrapheneOS. It's rough but at least it gives me peace of mind.
In any case if there is really no viable business model for private mainstream mobile computing we have been duped big time: This is not a consumer device, it is track-and-trace machinery.