Good question Papalui.
Suggest everybody here tries this on a one on one comparison and makes their own judgement of the two results. Whether anyone thinnks its a good thing or not will obviously be a rather individual thing. Ofcourse it will also depend entirely on the type of coffee (beans) being used.
If what you say about the bled shot being more mellow (well not necessarily exactly in those words) is true, it may well be a great thing for espresso only, but is it a good thing for milk/espresso based drinks? Therefore suggest the same comparision with milk coffee as well, with just one small note that it should I think be done with correct sized cappuccino cups and not milkshake-a-chino cups where there is the distinct possibility that the mlik espresso made with the "bled shot" could just lose it all and become even more thoroughly milky with no character.