Interesting take from Ryan Szymanski. One of the big items is the sustainment in both strike and defense that a big ship can provide while smaller ships run out of missiles and/or fuel and must retire from the area, although perhaps the reload capability of VLS cells at sea will become normalized and alleviate that concern. And yes, the original design only shows 128 VLS cells, but the volume of the much bigger ship allows for growth, especially if the helicopter facilities are deleted.
As Spekkio mentioned above, and I wondered about a decade ago in Ship Photo of the Day, would we see a return to non-aircraft carrier capital ships when technology improved? The carrier replaced the battleship 85 years ago when airplanes could outrange guns - have/will we reached the stage where hypersonic missiles and cruise missiles turn the table? And if not this “battleship”, is there a place for a 20,000 - 25,000 ton large cruiser?