A persistent graph is a wonderful abstraction for simplfying software development. Most developers develop on top a database. Either they actively read and write from the databse, or they use an ORM, and that introduces a bunch of other problems. I don't. I do computations on a graph of python objects sending messages to each other. I am barely aware that somewhere objects are being read and written to disk. This is a huge simplificatoin in conceptual complexity.
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