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Why is always about bash? POSIX shell scripts run everywhere.
BASH has some useful features and I’ve literally never had an environment with bash unavailable (even if a package is needed, so what).
MacOS ships only 3.something version, which has some compatibility issues with Bash 4+.
brew install bash
Granted, it’s a kind of niche use case but in the embedded world there’s usually size constraints which prevents a full blown bash installation.
However, things are better now than 20 years ago. Flash is cheap.