This package is inteded to be used to have one exact address that router always answers on. This makes it less confusing for unfamiliar users.
This prevents few issues. One example is when user or some automatic operation changes router's lan IP range then documented IP 192.168.1.1 is no longer functional. The worst case scenario is that some upstream router or service is going to answer on this address. That can potentially confuse less experienced users so this prevents it.