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This is actually encouraged by POSIX.

set -o vi: "Allow shell command line editing using the built-in vi editor. Enabling vi mode shall disable any other command line editing mode provided as an implementation extension."

No other mode, specifically emacs mode, is included in the POSIX standard.

Take from this what you will.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...

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Not surprising.

Back in the heyday of POSIX standardization, the Emacs camp and the POSIX camp were both very opinionated and not entirely aligned. One example is the standard disk block size used in command line utilities such as du and df. RMS made GNU use 1kb instead of the POSIX standard 512 byte size, but this could be overriden by setting the environment variable POSIX_ME_HARDER.

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