The current world 3C champion believes that a single stroke is sufficient. I agree with him.Harry Sims taught an UpStroke or rising tip, for some shots particularly diagrammed is one example. ...
Of course, if you think of a variety of strokes, and that helps you prepare for various shots as needed, it may work for you, but it doesn't correspond well with reality.
There are many strange beliefs among players. I know one who even thinks you can draw the ball by hitting it in the center. He addresses the ball at the center but of course he doesn't hit it there.
The test, of course, is to present a precise diagram of a shot that requires a special stroking technique. (Other than when the shot is somehow hampered.) I think no such shot exists.