Are you saying that just to view the final sequence you have render it 3 times?
or are you saying that to see and work in a nest you have to render that too?
I would think that nest renders should propagate upwards (be seen as a single stream by the final seq)
BUT if you render the final seq, that won’t necessary propagate downwards to the nested sequences.
(as PPro is generating a final singlefile that is attached to the main sequence).
PPro (or FCP as I know for that matter) doesn’t have a smart render system in that it will look at the clips used in the main sequence and then attach renders to all the subordinate timelines.
Does that make sense?
Alex