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What is the benefit of defining some view as flow view node?

View node can be defined using FlowBuilder#viewNode or using view tag in faces-config.xml or in separate flow definition file. E.g.

<view id="page2">
    <vdl-document>/flow1/flow1-page2.xhtml</vdl-document>
</view>

I understand that this definition is required for determining the start node. But why define other views as members of flow when

  • other views have access to flow scoped beans too,
  • navigation from flow view to non-flow view works ok?
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