But basically copying functionality that takes a while to build.
1. Design system [1] that's integrated with Compose. Meaning blocks are built as part of other blocks.
2. Networking and caching - these can take half a day to assemble and debug.
3. Test integration. Easily days or weeks to do on Android, because dumb stuff like some misaligned libraries.
4. Dependency injection, also harder to set up the larger code gets.
[1] https://bradfrost.com/blog/post/atomic-web-design/