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Why would one bother when clojure has core.async, short names and everything else?

The tooling is complicated with Clojure. If you are teaching an introductory class, having a single simple install of DrRacket is a big plus.

Good point. Though I'm not so sure it's such a big deal in comparison of using a language that's not entertaining.

Because racket has hygienic macros and #lang, and syntax-parse.