Hardcoded bash path?

[julian-hoch]

This is just a quesiton - is there a reason why the bash code is hardcoded to /bin/bash?
Since I run NixOS I always have to manually change it o /usr/bin/env bash, since /bin/bash does not exist. But perhaps I am missing something?

[gdevenyi]

POSIX standard requires env to be present, so switching to using it for all shebangs is a reasonable change