I think that if you look at the history of the 5-inch gun, you will find many references to ill-functioning GPS systems.
I’m fully aware of the long development saga of the Army Copperhead and Excalibur rounds, and the failure of the Navy’s ERGM and BTERM.
Sometimes things do get figured out eventually. The USN had a UAV ASW helicopter program in the 1960s called DASH - it was a complete falure, 50% crashed within a year or two, and they were replaced with manned helicopters.
Doesn’t mean the Navy shouldn’t be giving it another try today with improved enabling technology.
On the other hand, stuff like the Airborne Laser didn’t work, and there is zero evidence that anything like it will ever work.