Ideally "action" would be seperated into two different methods, one for manipulating resources (like state machine transitions, or other processing), and one (u

Ideally "action" would be seperated into two different methods, one for manipulating resources (like state machine transitions, or other processing), and one (utilizing GET) for aggregations and computations on collections or resources. They have done that. See 5.6. Query. Just a mistake by the parent.