Before that, Go did preempt on function calls. Haskell preempts on memory allocation. There is no idiomatic Haskell code that loops without allocating, but it is possible. Go code that loops without function calls is probably a lot more common but still avoidable.

I wasn't comparing Go to every language ever, just the ones people are most likely to pick. In that group Go (and Elixir) have more unique concurrency models.