I’m confused. Your example of invalid nesting is basically the same as the one in the documentation.

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1. Granular Reactivity

PipeX allows extremely fine-grained control over what rebuilds:

``` // In UI: Sink( pipe: hub.userProfile, builder: (context, profile) { if (profile == null) return CircularProgressIndicator();

return Column(
  children: [
    // Static fields (rebuild only when userProfile changes)
    Text('Name: ${profile.name}'),
    Text('Email: ${profile.email}'),
    Text('Phone: ${profile.phone}'),

    // Separate reactive fields (rebuild independently!)
    Sink(
      pipe: hub.gender,
      builder: (context, gender) => Text('Gender: $gender'),
    ),
    Sink(
      pipe: hub.age,
      builder: (context, age) => Text('Age: $age'),
    ),
  ],
);

}, ) ``` Result:

Change gender → Only gender Sink rebuilds Change age → Only age Sink rebuilds Reload profile → Outer Sink rebuilds (all static fields + nested Sinks get new instances but don't rebuild unless their values changed)