That's technically not true.

You can pass multiple return values of a function as parameters to another function if they fit the signature.

for example:

  func process[T any](value T, err error) {
    if err != nil {
      // handle error
    }
    // handle value
  }

this can be used in cases such as control loops, to centralize error handling for multiple separate functions, instead of writing out the error handling separately for each function.

  for {
    process(fetchFoo(ctx))
    process(fetchBar(ctx))
  }