#1- no England’s nice too, If you like rain
#2- there is a wider variety of yeshivas in Israel, while you may not find you’re place here the chances of you finding it there are higher
#3- learning independence for one thing, also, seeing different types of people, especially in the bigger yeshivas, leads one to evolve his viewpoint of other Jews and learning how to get along with people who are not exactly the same
#4- no but it helps!