Wouldn't it be cheaper to integrate DDR chiplets in the package, like Apple is doing? Even though the approach is not competitive with HBM in performance, on Ap

Wouldn't it be cheaper to integrate DDR chiplets in the package, like Apple is doing? Even though the approach is not competitive with HBM in performance, on Apple processors it does seem to offer better power efficiency and bandwidth compared to off-package memory. But for some reason neither Intel nor AMD are moving in that direction.