Maybe I'm unique, but nowadays 99% of my phone time is spent in a browser. If anything, it seems easier now to get something like this going because all you'd need is a bare bones UI and a good web browser.
Sure, it's not competitive with a Samsung foldable, but he I've gotta start somewhere...
I do sort of wonder if an x86-based phone is at all a reasonable prospect. It seems a bit weird to go backwards but at least they've sorted out the generally open ecosystem part XD. Power consumption is 99% about the software anyway.