Your Athena data set are immutable S3 blobs of data however, while Postgres reads data that could be modified while it's reading them, concurrently. Postgres h

Your Athena data set are immutable S3 blobs of data however, while Postgres reads data that could be modified while it's reading them, concurrently. Postgres has to deal with a transaction modifying 100,000 rows in a table, needing that transaction to then see its changes but then aborting, leaving the data exactly as it was before. Athena/Presto don't have to worry about any transactions, table files bloated by changes that need vacuuming, etc. etc. So I don't think it's fair to claim PG does not scale, when you are comparing a transactional and analytical database.