In medicine something is only done if it outweighs the risk of not having the procedure, the less that has to be done the better so if they feel its necessary there must be a reason y.
Thanks for your well wishes - however, I think a lot of medicine as it is currently practised is not evidence based, and I've had too many doctors do things to me for convenience to trust that they are always doing things with good reason. At this hospital, even more so!!