shunping commented on PR #34899:
URL: https://github.com/apache/beam/pull/34899#issuecomment-2868931621

   If every PTransform has only one input PCollection and only one output 
PCollection, then it sounds also ok to say a Pipeline is a DAG of PCollections. 
   
   However, some PTransform takes multiple inputs, like Flatten. Say the input 
PCollections are A and B and the output of Flatten is C. It will be weird to 
say A,B,C are nodes, because now we have two edges A-C and B-C, and both edges 
represent the same Flatten Transform.


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