Like it says in the title, I think it would be nice to be able to loan out your player that you maybe don't use so much but still want to keep, so if you have a young player that you don't use but still want to keep, you can loan the player out to a club who is in need of a player, but don't maybe have the money to buy one, so a loan would be better, and also your player would go up in experience/stars!