Why simply enlarging the Arleigh Burke hull is a dead end

Why not enlarge the Arleigh Burke hull by about forty percent to create a cheap cruiser?

Because the Burke is already an overworked old-form hull; the Navy needs a modern growth platform, not another enlargement of the same constraints.

The Arleigh Burke hull is already heavily worked and carries successive generations of equipment within an old design framework. Scaling it up would preserve limitations rooted in 1960s and 1970s hull theory instead of exploiting later structural and hydrodynamic development. The Zumwalt hull is a useful step toward a new baseline, even though that program tried to introduce too much technology at once. A modern hull remains necessary despite the risks of overloading its first design.