I don't think Android and iOS UIs are necessarily more complex than React. And yes, I've shipped code in all three, for... way too many years, at this point. R

I don't think Android and iOS UIs are necessarily more complex than React. And yes, I've shipped code in all three, for... way too many years, at this point. React's trying to add functionality & developer workflow on top of an existing UI system (document rendering system...) that wasn't meant for application UI, has barely been modified to accommodate it since using it for that became normal, and isn't doing React many favors, and for bonus LULZ it's doing that in a single-threaded scripting language that somehow manages to have both too many and too few features to capably support React's vision, with the result that they're constantly fighting & replacing all the technology they're working with. This puts it at a significant disadvantage versus any half-decent native UI toolkit, when it comes to complexity.