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Searching the Nix package repository can give you a good idea of how prevalent some software are used as a dependency because Nix packages requires all dependencies to be explicitly specified by design. Now, a quick search for "which" yields 2.5k hits [1]. Although a non-negligible portion of hits are just common uses of the word "which" in code comments, the other large portion of the hits are indeed dependencies on the "which" package. Although the use of the "which" command might potentially be fragile when considering cross-platform use, it seems like a really bad idea to deprecate it from a pragmatic point of view.
[1]: https://github.com/NixOS/nixpkgs/search?l=Nix&q=which
"command -v" isn't reliable because several shells (including Dash) don't obey the POSIX standard. See https://github.com/oilshell/oil/blob/8fbc09bb3254cee944b0450...