People need both. REST works well for CRUD operations that don't have complex side effects or constraints. What's often missing in this is intent. I just want to do "the thing" to this particular account or whatever.

Personally I like to very selectively add RPC actions on top of the base resource. Tacking an RPC action onto the resource URI allows you to encapsulate the intent of the user's action, handle all the updates required server side, and then return the updated representation.