I remember component sharing being a topic on day 1 with react native. I also remember it coming up a lot about 5 years ago when MS launched a component library that theoretically did this (didn’t seem to take off). I’m skeptical of the approach given that so much time has passed, with so much incentive, and it still hasn’t happened.

Building both SwiftUI and Jetpack Compose apps is definitely a ton of work, but I think the right choice at scale. Before “scale” is “achieved”, I’d advocate for doing one platform well (there’s often an obviously more important one) and packaging the web PWA for the other platform.