Hmm... well I understand where you are coming from, but I am not sure I can agree. I would totally be on board if we were talking about some random root app that wasn't tested and talked about, but if the app, such as this one, seems to work, we have confirmations that it roots properly and there are no issues, why not advocate the use of it?
I feel this is exactly like Hackintoshing a computer. There was the longer/harder way, and now there are much more simply guides to do it. Not that the app is easy and the way you are suggesting is hard.
But to confirm... z4 works to root and vice versa unroot on the Samsung Fascinate?