why CRUX has "sh -> bash" symbolic link concept

i notice that my ".bashrc" and ".bash_profile" files just do not work and then i see i am no longer running BASH but "sh". then i notice, there is no "sh" , "/bin/sh" is just a symbolic link to BASH. i know and i can solve my problem using "chsh -s bash user" but i want to know why CRUX uses "sh -> bash" symbolic link instead of simply using "/bin/bash" as default shell. -- http://arnuld.blogspot.com/