For Aquameta's purposes, we're trying to make it easier for people to build visual interfaces that do programming. Higher up in the stack is a PostgreSQL admin GUI. Without meta, the backend of this interface would be the DDL grammar, so when the user took GUI actions, they would be converted to CREATE statements etc under the hood using string concatenation and other dreadfulness. With meta, we can instead just build against meta's data model, so that building this GUI just as simple as any traditional web data manip interface. It seems more elegant and simple.

It is a lot easier to shoot yourself in the foot. You can do very destructive operations through meta. It's more powerful for doing useful things too. Just be careful.