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My 2c as Python user:
Back in 2010, I've used multithreading extensively, both for concurrency and performance. Others used multiprocessing or just shelled out. People talked about using **the other** core, or sometimes the other socket on a server.
Now in 2020, I'm using asyncio exclusively. Some colleagues occasionally still shell out 🙈. None talking about using all cores on a single machine, rather, we'd spin up dozens of identical containers, which are randomly distributed across N machines, and the synchronisation is offloaded to some database (e.g. atomic ops in redis; transactions in sql).
In my imagination, I see future Python as single-threaded (from user's point of view, that is without multithreading api), that features speculative out-of-order async task execution (using hardware threads, maybe pinned) that's invisible to the user.