I've always thought the real advantage of a revolver is reliability. When you pull the trigger 6 times, you get 6 shots, without the risk of needing to perform immediate action on a jam.
In terms of a backup gun or home defense, it makes sense, though I definitely see the appeal of a high capacity magazine and single action firing. Though for home security, I've always been dubious of automatics, where it's possible that the magazine would be under pressure for weeks or months at a time.