Yeah, agreed. In fact there's two API add-ons, I think.
Then there's the Kotami bridge by @Luke Foreman. Definitely more of a developer tool. It would be up to those developers to decide if their add-on is better situated in that category or not, of course, but I'm sure some will.
EDIT: @guiltar has an add-on that added some additional code events, that's definitely dev focussed too.