It does have drawbacks, but having use crossbar.io for python/js/java/php, the benefit is huge if it abstract away the transport and gives you well crafted high

It does have drawbacks, but having use crossbar.io for python/js/java/php, the benefit is huge if it abstract away the transport and gives you well crafted high level primitives such as routed rpc and pubsub out of the box. Also, you can switch to microservices later for peanuts.