Why Force Z needed depth behind Singapore

Was deploying Force Z a mistake?

The force itself was defensible, but its forward placement was not; an Indian Ocean base would have made it a stronger mobile deterrent.

Basing the force farther back in the Indian Ocean, around Ceylon, would make Japan reach for it while the Royal Navy reinforced it more easily. That position would turn the ships into a mobile threat to an invasion rather than assets tied narrowly to Singapore. It would also give Admiral Phillips more time and operational room to decide when to strike Japanese forces advancing down Malaya.