In my opinion, while individuals who employ multiprocessing, asyncio, or multithreading are explicitly aiming to develop concurrent programs, those who utilise subinterpreters may not necessarily have the same intention. For instance, an individual could create a compact runtime environment to emulate a secure container for executing arbitrary Python code. So I believe placing the multiple interpreters library under the concurrent namespace may limit its perception to solely concurrency, when in reality, its capabilities extend beyond that.