Have to admit the 'aluminum asploding' concept in the name of 'undefined fatigue life'...every blue moon, this topic seems to show up on a bike forum.
Used to be more of these sudden explosions related to carbon fiber...like the fear of it more than the reality... but now carbon fiber is becoming a bit more mainstream and of course, what bike now doesn't have a carbon fiber front fork at least?

So, I will put my final take on it. Aluminum is good, and carbon fiber is king. That's all.