The idea that suffering ennobles us or makes us stronger or better is a load of crap. If you look at the happiest and healthiest people in this world they have experienced very little suffering and actively avoid it, which is a smart move on their part.
I know people who suffered most of their life and they are bitter, cynical and tired, they may be good people but the hardship made them distrustful and defensive.
It's often said that children are wise beyond their age after they've gone through a lot of bad things. They are nothing but wise, they are frightened, quiet, anti-social, depressed, distrustful, cynical or hateful (these are all bad things even if you appreciate some of them). The only wisdom that they've gained is the understanding of human capacity to harm others, they just know about the evil.
It could be argued that when one is already an adult it's enough to experience great hardship exactly once and not more than that. It may give the person a strong reference point to value what they have and never get any close to bad things again.