You missed the most important part of my point. Someone who crosses the finish line at the same time as someone else, but started from further back is almost always better at doing the job.
I already said it's very difficult to objectively measure. But any improvement in doing so will give you a competitive advantage in finding the best candidates.
The US military used to think successful soldiers with childhood trauma, had coping skills that protected them in deployment. When they ran the studies, they found they were completely wrong - people with childhood trauma, regardless of their military success, were multiple times (4-6x odds ratios) more likely to develop PTSD, (re-)start smoking, or misuse substances.
It's a neat narrative: go through hardship + come out the other side = better coping skills / more productivity. However, humans are complex and often fragile.
I accept the argument that a person who has experienced more hardships has accomplished more to reach that same point. That could be justified if your hiring principles are "who has earned this spot more". It doesn't necessary follow that their trajectory has a steeper slope from the point of hiring.
You've also created a strawman. I never mentioned childhood trauma or much at all of early life aside from growing up poor. Whatever trauma that may have caused certainly did not interfere with their accomplishments to date.
> The US military used to think successful soldiers with childhood trauma...
This is not war nor the battlefield. Let's see studies about people and their career success.
Maybe Charley had depression and anxiety and never made any friends while Joe is outgoing and did allowing him to form study groups easier. Maybe Charley's parents insisted he become a lawyer and he never touched code until college. Maybe Charley has a speech impediment, maybe he is ugly, maybe he is on the spectrum, maybe, maybe, maybe.
We are here to judge how someone can do the job, not go through their life history trying to judge how much harder or easier they had it than someone else.