Consistency, makes it easier to understand. When it would automatically pick the only possible answer, you might think that you accidentally clicked on the next

Consistency, makes it easier to understand. When it would automatically pick the only possible answer, you might think that you accidentally clicked on the next link already or that something else happened incorrectly. You would have to add a message stating that the system auto-selected the only possible destination. It’s also (slightly) easier to implement. Both not hugely problematic, but in my opinion its the correct decision for this case.