I don't know from where everyone develops the theory of blending everything. It has to be Wrestling Station who made this rule/theory that whenever you make a signature, totally totally blend everything to the maximum and don't even leave a corner untouched.
That's not really the case every time, having a PSD with different colors, contrasts, thresholds, filters, effects and layer masking are all good as well. Blending everything else is at it's own place but saying that the blending is not good every time you see a signature is a mistake at some level or the other, there isn't need of complex blending in a signature for a soccer player however having 5 PSD's of superstars on a poster might require blending. By the way 90% of the people don't know what blending is, you duplicate a layer and change the blending modes. Mess around with adjustments and come up with something creative - not all the time bro you need to go simple at times and that's my theory.