Aircraft support & logistics, too, have become much more efficient with computer networks, supply-chain-management tools and worldwide delivery. Result: savings from commonality may not be as important as they used to be.
It's not just about savings, at least not for USN. For USN, space on board the carrier is a
huge deal. By having just Hornets aboard, the carrier only needs to stock parts, tools, and trained mechanics/specialists for one jet engine type, rather than 3 or 4. Not to mention the parts, tools, and trained mechanics/specialists for landing gear, flight controls, hydraulic systems, pneumatic systems, avionics systems, environmental systems, fuel systems, structures, etc etc etc for one type of jet rather than 3 or 4 types. This is a huge deal for a carrier.