Some of their arguments seem debatable, but my biggest issue with stored procedures with Oracle is purely economic - It is MUCH cheaper to scale the application layer than to scale the database layer. Therefore, if you want to scale cost effectively, and you want to use Oracle, you should put as much logic in the application layer as possible.

The article says 'if you have millions of users, you should be able to afford decent hardware.' - that is misleading, because the cost of the hardware is miniscule compared to the cost of the Oracle licenses you would need.