If I really wanted a revolver with as few moving parts, and thus as small a chance for malfunction, as humanly possible, I wouldn't buy a S&W regardless of the lock but rather a Ruger. You see Rugers lack a rebound slide and hammer block and, with the exception of the Six Series DA revolvers, their ejector rods cannot come unscrewed.
Unfortunately, they have locks now too, albeit hidden under the grip where S&W should have designed them (or in the back of the hammer ala Taurus), also if they absolutely had to have them. Then we would not have the I.L. supporters whining about people whining about them.