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> In any language with any concurrency support there's a point where you spin up a bunch of threads to do something.

No, that's not true. Think javascript (and I hate javascript): you can do concurrency even though you literally don't have a way to spin up a thread in the browser.

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You actually can spin up a background thread in the browser now using web workers[0]. Although, like you mentioned, you don't actually need threads for concurrency. The event loop handles concurrency even in a single threaded environment.

[0] https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers...

Erlang was originally designed to have a great concurrency model that ran on a single core CPU! Preemptive scheduling is super cool!

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