I don't think there's too little demand, I think there's too much profit incentive in the other direction.
Only a tiny number of companies on earth have the resources to build a successful mobile platform. If you are lucky enough to be one of those companies, you're not going to leave money on the table.
The harsh reality is that manufacturing capacity and network effects actually prevents building an open ecosystem phone. You will never be able to purchase the best chips and displays.
I think we need to stop pretending that regulating competition is a bad thing. Competition is what makes capitalism work as an economic system. Without competition capitalism is inefficient and harmful. If we can inject more competition into the system as a whole, wherever possible, it's going to be good for consumers.
We can take these analogy absurdities wherever — the harsh reality is that nobody is stopping someone from building an open ecosystem phone. But there isn’t enough demand.
As a consumer, why should I care? As a company, unless I’m building my own walled garden for company phones, why should I care? What’s the market here?