The crux of it is that the weapons have improved very fast (range and energy density and targeting and rate of fire and other functionality all improving very f

The crux of it is that the weapons have improved very fast (range and energy density and targeting and rate of fire and other functionality all improving very fast) but protective systems like armour are not nearly keeping pace. It's looking a bit like the struggle between armoured knights and guns. The place where the rubber really meets the road on this, the Big Problem, is surface navy: what's the lifespan of a floating metal castle in the age of hypersonic missiles? Nobody wants to talk about that.