For me, because my hand has a high arch and I completely float with no contact on the top of the guitar and my fingers also are bunched in a loose fist (in a Raphael Fays type of fashion?) , I have an angle of attack that is impossible to use with a normal “pointier” pick. For me, a regular pick is not any better than using a pencil to play with. Imagine how a pencil would “catch” on the guitar strings, especially when playing fast. Since sometimes I need to pick fast with a trill, I cannot allow my pick to “catch” on a string.
The dull Wegen also gives me the ability to play without worrying too much about how deep my attack is on the string. I am able to push the pick deeper when playing quickly (something i could never do with a normal pick without breaking a string) and obviously this gives me louder sound when I do so.
So basically, after I have done a terrible job of explaining this, the pick allows me to get more volume during very fast playing because I can attack deeper. I get, in other words, better volume dynamics with this pick, and also a slightly different tone which helps tone down an already very bright sounding guitar.