Look at Fairphone. They're doing a modular, fully repairable phone build in a form factor that's only slightly bigger than current phones. They're not quite perfect wrt. openness, Linux status etc. but getting there.
This actually confirms my points. They are a niche company doing a niche device for a completely different target market, entirely not focused on performance but eco-friendliness. They are not mainstream competitive. The devices’ camera is at best usable. Also: needs Android to work at all.