Your true value is shown if you are disposable and still have a job. This means that your work is actually appreciated. If you kling on to your job by having a bunch of old applications that just don't work unless you're around, then in my opinion you have failed.
The same goes with the applications that you make. If you make applications that depend on your future presence you are just gathering new responsebilities along the way. In the end you are not going to be inovative because your past will haunt you.