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by Spartan-S63 2164 days ago
They've really only spent about a year or so on async support in Rocket. They were waiting for async/await to stabilize and the async runtime story to centralize a bit (though they picked Tokio as the default).

Features like CORS are available via third party fairings, but I could see them being incorporated in the future in the `rocket_contrib` portion. I think the goal is to keep the overall framework pretty light and put more things into the `rocket_contrib` portion.