Swept wing military aircraft are very high drag in the landing config and it is easy to loose speed over the fence if you are a bit fast. They also tend to be able to stop quickly on military runways which are normally quite long. Today's airliners are slippery little beasts and it has been judged that the decision as to whether you have got everything under control for landing will be made generally at 1000ft (other criteria are available). This takes away the option for the pilot to hope for the best and, it will be ok, when the approach is too fast or high. Being stable at 1000ft also allows for factors such as positive wing shear to be coped with more easily on finals. Oh, and the military chap has his rapid exit facility if he goes off the end.