Tangent Propagation - what is it good for?

Hello SW forum community,

My group here at SW are evaluating and re-evaluating many functionsof SW. One that I'd like to get some feedback from those of youthat do part design that requires draft is:

Where in your designs is it important to have and not have(option given to the user) tangent propagation when using the draftfeature?

For instance, when creating a partline option draft, there is anoption to include adjacent edges (faces). Is this something thatshould be on by default, off by default or not an option at all(make tangent propigation off by default.)

If you could give an explanation and also an example I wouldgreatly appreciate it.

ThanksSolidworksParts And Features