Using armor to keep modern warships repairable

Which lost industrial skill would be useful to restore, and why favour armour-steel rolling?

Armour-steel rolling could support reinforced subdivision around engines and critical computers, reducing damage to systems that take a long time to replace.

Restoring armour-steel rolling is proposed as a way to strengthen selected internal protection in modern warships. Subdivision remains the preferred basis of protection, reinforced around engine rooms and critical computer spaces. Damage to these expensive systems could keep a surviving hull out of service for much of a war because replacements are production bottlenecks. Local armour is intended to limit damage from a hit elsewhere, so that critical equipment survives unless struck directly. This is a proposal to preserve operational availability, with damage to less critical areas still expected.