It would make memory-poor phones more viable. Like why can't we have a 512MB, or even 256MB RAM phone. Although I doubt that the software effort would be cheaper than just buying the extra RAM. It's definitely much more uncertain.
Those exist, they're just feature phones. Smartphones have to run general purpose apps and that takes RAM.
Those exist, they're just feature phones. Smartphones have to run general purpose apps and that takes RAM.