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I'm not sure this is entirely true. Proper tinning eliminates stress cracks and, if done correctly, will end up a more robust connection than crimping. Crimping is, however, far more economical when compared to soldering and I believe that's the attraction to it.
I've seen what some people consider "soldering". It's not balling up wads of solder onto wires until they stick together. That is what will result in cracked solder joints.