Whenever I see a blog post on Python concurrency that recommends something other than concurrent.futures ThreadPoolExecutor or ProcessPoolExecutor, I shake my head in disappointment at how far we've strayed from "one obviously right way". Why in 2020 am I seeing someone manually close and join a worker pool (blocking!) to return all results all at once because they rewrote executor.map using multiprocessing? Why do they del pool immediately before returning instead of just letting it run out of scope? Why are they using map, which orders the result, if they just want to call all? If performance matters, you want to read the results in the order of completion not the order of submission, and you don't want to wait for all of them to complete if any of them fail. Where did Python's "right way" go sideways?