I think the concern is that if interactors use `call`, the temptation will be to use actual procs or lambdas within organizers. While technically that might work, an interactor could then no longer be easily serialized (YAML or Marshal). An interactor *could* be serialized for adding to a background queue. This isn't really something we're actively concerned about at the moment. Plus, if serialization is a concern, you can simply choose not to use procs in your organizers and the issue will never arise.