People used to buy a bike and keep it for the rest of their lives. Some people
are very careful, never crash, and never run across a dumb wrench monkey in a bike shop.
I am not that person. I lean my bike against boulders in the mountains, sometimes find terrible mechanics, crash, you name it. It's why there are no carbon touring bikes. They will only take so much abuse.
Nothing against carbon, it just doesn't work for me.