Asynchrony should be a property of how a program is run, not a colour baked into the type of every function in the standard library.

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• Function colouring is the real cost of async/await, and green threads like Go's avoid it — but for an existing runtime such as JavaScript or C#, async/await was still the right solution. AHAnders Hejlsberg13 May 2026similar wording
• Splitting functions into synchronous and asynchronous kinds forces that distinction into every piece of code a programmer afterwards writes. BNBob Nystrom1 Feb 2015similar wording
• Async/await makes asynchronous code easier to write without healing the split it created, and the divide reappears as soon as you write a higher-order function. BNBob Nystrom1 Feb 2015similar wording
• Concurrency is hard not because human brains cannot handle it but because nobody gets enough practice at it. HWHillel Wayne29 Jul 2026similar wording
• The speed of a system is set by its longest serial dependency chain, which is a property of the architecture and cannot be parallelised away afterwards. CMCasey Muratori26 Aug 2026similar wording

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