There's a reason why the DC-10 isn't used anymore.
Incorrect. DC-10s were perfectly safe aircraft that flew millions of miles. They weren't explosively decompressing left right and center.
DC-10s aren't flying passengers any more because they don't have the efficiency of modern airliners like the 787. They're heavier, have more drag, and burn more fuel - Particularly due to the their three engines.
FedEx still operates a whack of 'em hauling cargo.