That platform gives the ship a uniquely offensive capability, and is one of the main features as a weapon capability. Yet it is in a ship class (destroyer) that you claim is defensive.
Are you suggesting Zumwalt is to protect the fleet from threats masses on the shore?
Your opinion doesn't preclude the fact it is a cruiser with a stated primary role of replacing the tico in providing wide area antiaircraft defense. Defense! Cruiser! Defense!
So here we have the two newest ship designs, a destroyer for offense and a cruiser for defense. So much for labels.
Destroyers are having to operate in more roles, because we do not have any other ships that can do those jobs. The Battleships are all gone, the Heavy Cruisers are all gone, all that is left in another decade are Destroyers.
The idea of the LCS (Littoral Combat Ship or Little Crappy Ship - take your pick) has merit. Ideally they work in shallow waters, normally close to shore. They are "stealthy" (not to be confused with "stealth"), so they are ideal in doing patrol missions away from other ships. The Persian Gulf, Gulf of Mexico, Philippines, off Somalia, these are some great places for an LCS to operate in. Also in fleets revolving around an amphibious force.
But they are not the "heavy hitters" that are needed to protect capitol ships. They are almost literally "jack of all trades - master of none". I see them as useful ships, but not as any kind of replacement for the Burkes.
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Now this is a bit of a pipe dream I know, but I would like to see the Tico's replaced with a ship that is no longer in service, the Heavy Cruiser.
The biggest hole we now have is big guns. This may not sound like much, but if you are a Marine on shore there is nothing better then knowing a lot of hurt is coming in on the bad guys. And since the last of the Iowa class retired, our ships only have missiles and 5" popguns.
But one thing I admit, the Zumwalt shows what can be done to modern guns with modern technology. A 155mm gun that can fire at targets 95 miles away, very impressive.
Now I think a real use for that would be to modernize the basics of a ship like the Baltimore class cruiser. 2 turrets of 3 8" guns in the front, on the rear place VLS for multiple defense and strike missions.
But this is a ship I would not send with carriers, but with amphibious forces. I would rather see a "Flight III" Tico built for that purpose.