It is quite common to here "defense is dead" when thinking of information security today. This trite phrase has some truth, but is also off target in some ways.
The idea of defending a single point and being "secure" is definitely dead, though it was really never alive in the first place.
The idea of improving defenses to the point that your network or enterprise is harder than others to attack is a worthwhile effort and remains quite alive.
Work on improving your defenses. Don't stop because a vendor promises a tool that is a "completely new approach". Solomon really was right, even when applied to information security. "There is nothing new under the sun." :)