If Marzipan gives me an easy way to debug my iOS Metal apps on macOS (which isn't possible with the simulator), then it's already "good enough" for me.
I wouldn't read too much else into the project otherwise. Running iOS apps on a Mac may be useful for apps that are not much more than a glorified webpage (so... hmm, most apps?), but it won't be the way to "unify" the mobile and desktop worlds (which still doesn't make sense anyway).
I wouldn't read too much else into the project otherwise. Running iOS apps on a Mac may be useful for apps that are not much more than a glorified webpage (so... hmm, most apps?), but it won't be the way to "unify" the mobile and desktop worlds (which still doesn't make sense anyway).