Why would they still try it today?
Because it’s a “cheaper” construction methodology... supposedly. Yeah sure it’s lighter for the superstructure but you lose a tremendous amount of “armor” capability and aluminum has shown a tendency to melt and deform easily in a fire at sea situation.
If it had been me and weight was of a paramount concern I would have gone with a carbon fiber construction such as you see on the Airbus aircraft or the 787. Sure it’s a bit radical for sea-going warship design but I would have loved to have a prototype built to test it all out in a real-world environment.
The Swedes used a carbon-fibre composite hull on their Visby-class corvette.