Neither Ruby nor Python makes it impossible write threaded programs, with all the ensuing dangers -- their standard implementations just don't implement threadi

Neither Ruby nor Python makes it impossible write threaded programs, with all the ensuing dangers -- their standard implementations just don't implement threading very well. I think it's a stretch to say that this constitutes an intentional judgement about the downsides of using threads. For all their disadvantages, threads can sometimes be the most effective way to structure a concurrent program.