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Redshift is designed to fill the classic accounting datawarehouse role in an organisation. Whilst I'm sure there aren't too many companies with account ledgers that large (or any), I doubt too many accountants would be happy with statistical inference of their books... ;)

This new model of processing directly on S3 is pretty much aimed specifically at eliminating the "Load" part of the ETL process. Just dump to csv from whatever sources you originally had, and don't worry about the schema conversion/loading into a DB. The fact that it happens to scale to exabytes is just good marketing fluff.