> Concurrency itself is not desirable.
Sorry, but you this is misguided. You are almost certainly using an OS that gives you concurrency, even if you only have one core of execution on your cpu. Concurrency is only natural, and is in fact a requirement when you start talking about GUIs. Even for something like data processing, you usually have a thread doing the processing, and another thread controlling everything. The advantage of threads is the natural separation of tasks, simplifying how programs are written. Not having the advantage of performance in python is unfortunate, however this is only one use for threads, which is by far not the most common.
