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Well look at Erlang/Elixir. Async everything is fine if your language is immutable and has preemptable execution.

You just write code, and the system figures out how to break things up.

But that’s a system that was designed from the ground up to be async. In JavaScript it was added after the fact, and you as a programmer have to deliberately annotate your functions to be aware of what is and isn’t async.

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Elixir and Erlang aren't async everything. Everything runs synchronously by default, you need to use separate primitives to turn it async

By the way you approach it, JavaScript isn’t async everything because you need to deliberately define a promise or async function…

However the OP and I, are talking about async everything as a programming methodology and not as a fundamental part of the base system.

Async != concurrent.

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