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The key disadvantage is largely that it bifurcates the library base. Async libraries and sync libraries co-exist uneasily in the same program.

For nearly every popular library there is now a (usually inferior, less robust) async one. The benefits of Linus' Law are reduced.

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Fair point. Async is a big enough idea that it probably warrants designing the language with it in mind. I guess another way of phrasing it would be that it violates the "there's only one way to do it" maxim, and the "two ways of doing it" circumstance necessarily came about because the idea was discovered long after the core language and libraries were already written.

Trifucates, since now there’s stdlib asyncio, and a popular trio async flavor too.

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