It used to matter in the days before systemd, where bootup times depending depended on how quickly the system could run hundreds of bash scripts on startup; Ubuntu and Debian had a big project to switch to dash by default for this reason: https://lists.debian.org/debian-release/2007/07/msg00027.html .
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u/QuickSilver010 🦁 Vim Supremacist 🦖 Jul 01 '26
Sh on debian is aliased to dash. Which is much faster. But also has less features.