Do you use output tunnel default values?

I have been studying the QSM-PC located at http://expressionflow.com/2007/10/01/labview-queued-state-machine-architecture/. It uses a lot of unwired output tunnels on case structures, and uses the "use default if unwired" checked. For an array, it turns out the default value is a valid array with zero elements, and this is crucial to make this particular vi work. Is it common practice among "professional" programmers to use default values this way?
Attachments:
Unwired_case_default.jpg ‏9 KB

I'll use default if unwired only for very specific instances. For example, a stop button event will have a true constant wired to the tunnel to stop the while loop. All other event cases would use the default of False since I wouldn't want to stop the while loop for them. It saves wiring up a bunch of false constants.
But in general, Using Default if Unwired could lead to bugs. Suppose you add an new case to a case structure but forget to wire up some data to the tunnel. With Default if Unwired, your code will not be broken, and the VI will run using the default data even though that wasn't what you intended. It may take a while for you to debug your application to figure out why things are not happening as expected. For example, a VISA reference works for a while and then stops working. Why? Because the valid VISA reference got lost when the new case ran and set it to a default value.
If you don't use Default if Unwired, then your run arrow will be broken. That will force to go find all those instances of unwired tunnels and force you to either wire them up or explicitly wire a constant to it. Basically it makes you find and make a decision on each tunnel rather than giving you a chance to forget about one accidentally.

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