I'd question if you really need to distribute work across machines. It's great this makes distributed systems easier to write but it's much better to reject the premise and avoid writing them in the first place.
Distributing the work across machines essentially comes for free with the ability to replay workflows from any step. You could run all of your worker processes on a single machine if it had enough capacity, but resuming a workflow on a different machine is transparent to your workloads assuming there's no local state.
