That all depends where your shell scripts come from.
In my experience most of the shell scripts provided by packages for debian, do use /bin/sh.
A quick check of .sh files on a couple of squeeze/wheezy installs showed that the vast majority of shell scripts using Bash come from node modules, which quite frankly is not surprising.
In my experience most of the shell scripts provided by packages for debian, do use /bin/sh.
A quick check of .sh files on a couple of squeeze/wheezy installs showed that the vast majority of shell scripts using Bash come from node modules, which quite frankly is not surprising.