Well it'll improve image resolution slightly. But cost a lot of low light performance, which is rubbish anyway without a whole bunch of computation.
The main problem with even the iPhone 13 Pro is that there is a big zoom gap between the 1x and 3x lenses which requires digital zoom and some horrible looking interpolation. It might improve that as you mention.
Here's a good illustration. Everything between these two is a crappy compromise which is pretty useless.
View attachment 1986284
But screw it I bought a mirrorless because I want completely linear zoom and a sensor that's a LOT larger than this one.