kennknowles commented on issue #23379:
URL: https://github.com/apache/beam/issues/23379#issuecomment-1259875113

   Just to clarify definitions, these days _late_ = element arriving for 
aggregation after the watermark has exceeded the end of window for that 
aggregation. Is there a reason that processing late panes is not sufficient 
here?
   
   My main concern is increasingly directly basing the output of a transform on 
nondeterministic inputs will break any invariants we might hope for. Like 
mostly we want code to not be sensitive to this, or to be sensitive to it in 
well-behaved ways.


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