have you ever deployed an erlamg system?

the biggest bugbear for concurrent systems is mutable shared data. by inherently being distributable you basically "give up on that" so for concurrent erlang systems you ~mostly don't even try.

if for no other reason than that erlang is saner than go for concurrency

like goroutines aren't inherently cancellable, so you see go programmers build out the kludgey context to handle those situations and debugging can get very tricky