"Do one thing and do it well" is problematic for things that store a lot of data. Especially for things that are supposed to be an authoritative source. Gettin

"Do one thing and do it well" is problematic for things that store a lot of data. Especially for things that are supposed to be an authoritative source. Getting storage right is very hard. Either it's too low-level, and it's hard for applications to coordinate complex operations without corrupting data; or you end up putting a lot of features in and end up with a SQL dbms; or everything does its own storage and you have a mess.