I haven't see the smart phone that has the low shutter lag of an Instamatic 100 but that doesn't mean such as smart phone isn't out in the wild. What kind of price? Then there is the non-camera interface of a smart phone. It's not like a real camera. Even the shutter sound is fake.
The Nikon Z fc has a real camera interface. This is a thread about the Z fc, yes?
Dave