Hey. Regarding 1, compatibility is handled by a separate library, Primate's only dependency, rcompat: https://github.com/rcompat/rcompat ; it's a unified compat layer around Node, Deno and Bun.
As for 2, what would you consider a React-like example? The examples on the frontend are meant to illustrate commonalities between different frontends.
The webc handler does lack a few things like hydration, and this can be added if users show interest in it.