That's fine though right? Clearly, the developer thinks it will make financial sense to build it that way. If it turns out nobody wants it, then all the better

That's fine though right? Clearly, the developer thinks it will make financial sense to build it that way. If it turns out nobody wants it, then all the better, the market forces will drive down the price and make it affordable housing. The only one that loses in this case is the developer. Succeed or fail, it will be a plus for people who want to buy in a housing starved area.