Interesting, I don't want my phone to be attached to any other aspect of my life. I want it to be a communications device and that's about it. Maps and navigation are the one other thing that I think is really useful.
I don't want my phone to be able to touch my bank account, my email (other than a phone-specific email account) or any personal or work-related files.
What if you can spin up a personal server, and have it connect seamlessly to apps across all devices?
I understand your concern on having 3rd parties touching your personal information, so what if the lineage OS, firefox OS or any other set of "libre" apps, also brought with them libre, self-hosted services?
I don't want my phone to be able to touch my bank account, my email (other than a phone-specific email account) or any personal or work-related files.