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Starting the engine puts as much wear on it as driving for 50 miles. Automatic start/stop hurts engine longevity by doing that unnecessarily and should always be turned off.
My car uses 0.5l of fuel idling for an hour. There's no way in hell that a start/stop system would even save 10$ a year, so there's no benefit to using it.
Believe it or not, they thought of that when they created start/stop systems.
In cars with these systems, the back pressure in the engine's cylinders is greatly reduced via a variety of strategies including selective alteration of valve timing and purpose-built secondary valves. What this means in effect is that the torque required to re-start the engine is a fraction of a dead cold start, and even a fraction of a normal warm start. This should serve to minimize additional destructive wear on components.
In effect, well-designed start-stop systems do not create any additional wear on vital engine components versus the engine running for that same period of time.
The difference in wear might be too small to measure, but what we can measure is how much fuel it saves. And that's usually less than 50l over the lifespan of a vehicle. Those systems don't even offset their own cost unless you spend all day at railroad crossings.
They are there for two reasons: Getting better results in unrealistic tests and decreasing the amount of control that owners have over their vehicles.