Well, yeah, if the details don't matter then you don't need "highly-capable simulators of the physical and digital world". And if the details do matter, then go

Well, yeah, if the details don't matter then you don't need "highly-capable simulators of the physical and digital world". And if the details do matter, then good luck having a good enough simulation of the real world that you can invoke in real time in any kind of mobile hardware.