I would really love to get my wife on a tandem... But our last co-pedalling experience was a paddleboat, and ended poorly (yelling, minor leg injuries, etc). "We" (I) 've gotten a lot more mature since then but still, she would definitely be a lot more open to the idea of a tandem cycle if the pedalling was not linked.
Is there an advantage to the linked pedals? Are independent pedals rare? More expensive? Etc?