Sorry, this is really a question in ArcGIS Ideas, but I think Kory will do a great job answering it.
I just noticed my hard drive was pretty full. Usually, it's Windows Updates that have built up over time. This time, I had 120 GB of publishing jobs that had finished and ArcGIS Pro was storing files of some sort related to the publishing process. Why is this necessary? If I had an idea, it would be to eliminate the need to do research and figure out why I have 120 GB of storage used up for jobs that published successfully. Why is this being stored?