It might seem like a consoling statement but it's not. Imagine entering a restaurant and you browse through the menu. You're hesitant as to what to order and after much deliberation, you settle for the prime-rib steak which is the house's specialty. You anticipate tasting the juicy meat and your mouth salivates. You tell the wait your order and he tells you it's unavailable.
At this point, anything else is damage control. That's not to say you can't enjoy the rest of your meal but you're not content when the waiter says "We don't have it sir/madam but there are other delicacies in the menu." It's simply not the same and your heart feels just as gutted. That's like saying the other person can easily be replaced when they're not. People are unique.