using guided ballistic missiles in war is indeed a scary precedent, but as the article explains, it is a precedent that was set 81 years ago
https://en.wikipedia.org/wiki/V-2_rocket and in particular iraq launched lots of guided ballistic missiles into israel in the first gulf war
the newsworthy part is not the ballistic missile launch but the interception in space, where velocity is lowest but maneuvering is most difficult
though to me the biggest news was that yemen's houthi rebels have ballistic missiles now