I don't get it? What's the purpose of changing the default rule in shadow-utils. Not only is it completely unnecessary and introduces risks for shell injections

I don't get it? What's the purpose of changing the default rule in shadow-utils. Not only is it completely unnecessary and introduces risks for shell injections, it also risks introducing incompatibilities between Debian and any other system. I feel that there are already too many other things to fix to be wasting time in creating new potential bugs.