Counterpoint: debugging erlang systems in production is a cakewalk. The tracing and introspection tools that come bundled in OTP make tracking problems down really easy. It's really hard to go back to systems that don't have erlang level visibility, so much so that it's kind of a crutch sometimes.
This is an ecosystem problem and not something inherent in a program using an actor abstraction.
This is an ecosystem problem and not something inherent in a program using an actor abstraction.