When the late Jim Cirillo used full wascutters in real life , it was for a very specific task. To prevent deflection on oblique hits on skulls of armed robbers with only a small portion of their heads exposed from behind cover. Not a typical SD scenario.
C.E. Harris's developement criteria included penetrating both shoulders of a deer. For wilderness survival , involving both small game , and up to deer, I can see his standard ( ie full ) vel wadcutters as being viable. ( Improvement over a Keith at same vel ? I don't know , but viable .). Once again , not typical SD scenarios.
For 95% of adherents , the primary virtue of the wadcutter is the modest recoil in Midrange ( aka target , aka 700fps-ish ) flavor. The rest of this discussion is trying to make virtues from necessity.
Yes , sometimes we are dealing with people with actual physical disabilities , who can only deal with little to no recoil. (Seperate discussion , w/ interesting possabilities .)
But effective loads from a lightweight small frame snub aren't supposed to be fun. 50rd of 158's from a 13oz M37 left my hand sore.
The larger question is the use of ( alum/ scandimum / whatever ) framed small framed guns , when they would be better served with a steel frame. Along the same lines is the use of small framed snub generally , when one would be better served by a medimum frame ( even if it wears a 2in-ish bbl).