Go concurrency is basically threads + the ability to choose between classic mutex synchronization (and all the problems with that like reentrancy bugs) or burn yourself in channel hell with deadlocks and buffer bloat.
Have to you agree with you there. I was pretty hyped for Go some 4-5 years ago but discovered its parallelism/concurrency model was essentially mutexes / condition variables / bounded queues when you get down to it. It's an improvement over doing it manually -- but definitely not a big one.