The suggestion is to make it possible to have multiple Find Battle searches at once and to have all other searches automatically cancelled once one search succeeds.
This would be useful. For example: The RoA ladders are often pretty dead so that finding a battle can take a very long time. So if there are multiple RoA ladders that someone likes then that person could challenge in all of them to lower the average time he has to wait for a battle. For example: If person A only wants a Format 1 battle and person B wants either Format 1 or Format 2, then it will occur that neither person A nor person B gets a battle if B gambles on searching in Format 2. But if person B could search multiple ladders at once then he could just search for both formats and find a battle against person A.
This would be useful. For example: The RoA ladders are often pretty dead so that finding a battle can take a very long time. So if there are multiple RoA ladders that someone likes then that person could challenge in all of them to lower the average time he has to wait for a battle. For example: If person A only wants a Format 1 battle and person B wants either Format 1 or Format 2, then it will occur that neither person A nor person B gets a battle if B gambles on searching in Format 2. But if person B could search multiple ladders at once then he could just search for both formats and find a battle against person A.