No, because you don't need to install Amber, and bc and sed are pretty much guaranteed to be installed already if bash is.

GitBash (MinGW) doesn't ship with bc or dc, but it does ship with awk.

This is targeted at Linux and Mac. If you're using Windows you are in the lucky position of probably not having or needing Bash.

GitBash is a POSIX environment that includes the titular bash, and it doesn't include bc, which is a direct counterexample to your original assertion. Lots of people who are stuck on windows for one reason or another still want or need to use bash, and that's why they use GitBash!

Clearly, if Amber did not have a dependency upon bc, it could then potentially provide value to those users.