And you've decided to disregard my point on redundancy outright (which is an absolutely crucial metric for a combatant warship, let alone for a fleet-wide air defense DDG at that).
We haven't even touch upon how large and heavy the DEs can get, especially for DEs with higher power outputs, in comparison to GTs. And we do know that hull spaces are a premium commodity on warships - Which is where GTs actually shine in this regard compared to DEs with their significantly higher power density (which leads to much more compact sizes).
I can get 80MW of power with 2x 40MW GTs, or 2x 35MW GTs + 2x 5MW DEs, or 2x 30MW GTs + 2x 10MW DEs, or 2x 30MW DEs + 4x 5MW DEs - And with every one of these options still being more space-saving than your idea of 1x 40MW GT + 4x 10MW DEs. You think stacking higher-power DEs is like stacking Legos or something? And there's still the redundancy and survivability factors to consider, as per the beginning of this post and my prior posts.
Fuel efficiency is NOT the overlord (let alone sole) factor at play when it comes to warship propulsion.
So what's the point?
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