Give me 380USD phone which lasts for next 5-8 years, feels premium, is repairable, camera is decent, replaceable battery, OS is just Vanilla Android with atleast 5 years(more years of Software updates would be welcome) of Software Updates and when you can't provide it, make it hackable enough to install Custom ROMs.
People pay that amount or more for apps that help manage their fantasy football team...
Comparitively that would be an insane bargain for a phone and it's absurd for that to be your requirement.
I do wonder what the right price point would be for a subscription model. At the moment the average replacement time is every 2 years which would be the equivalent of $30 a month basic and $40 for pro.
Could they afford $30 a month sub but you got the yearly upgrades rather than every 2 years?
If the price of the parts is quite low compared to the R&D that could be feasible.
But I actually have no idea.