If you are like me though, a lot of the tracks in a project will have several diffrent wav files in each. For creating a standard left and right summed file (i.e. mixdown or stereo interleaved export) then you are right, there is no reason to create silence between segments on a single track. However, if you want to take your project somewhere else for editing and or mixing, then it can make life a lot easier. If i wanted to take a project I recorded in Nuendo over to another studio and mix in Pro Tools, it is much easier to make sure every track at least starts at the same time location. If not, you have to load all of your tracks individually and then manually time align all of your segments. This can be a real headache depending on the amount of files that start and end with different time stamps. By creating some silence inbetween each file, you can save the project to a new folder and know that you just have to make sure that each file starts in the same place. I hope that made more sense.