The problem with file systems is that even if it's a competently implemented DB, it's a DB where you cant (easily) change the schema, put type restrictions on t

The problem with file systems is that even if it's a competently implemented DB, it's a DB where you cant (easily) change the schema, put type restrictions on the columns, or customize the indexing. File systems are great, but if you have a lot of data, using the right tool for the job is a lot better.