@Furbi ,
Actually, I think those who have a truly bad life backed with a truly bad Bazi are not very common.
Most of us will fall in the middle of a very large spectrum between perfectly good and extremely bad.
Some of us who have a bad experience might not be aware that the root cause is still a manageable aspect.
i.e. Wrong mentality about life, or unknowing obsession, nasty attitude, etc.
By having your Bazi read, it gives you this awareness of yourself and life around you.
The strengths, the weaknesses, the potential, the pitfalls.
And then one can take proactive steps to capitalize on the potentials and strengths, avoid the pitfalls and weaknesses.
Granted, the theory behind Bazi and destiny is that you can't change that road.
But it is also not so specific as to what exact event will take place.
A person still has wiggle room within the width of the road.
This wiggle room can give vastly different outcomes.
Take for example, a pair of twins, born with exactly the same Bazi under the same household.
Their lives can turn out completely different by the end due the environment they are exposed to, and the decisions they make.
Same for a person with a bad Bazi.
There are others with exactly the same bad Bazi, but the severity differs due to different environment and actions.
For me, Bazi and other fortune telling techniques, despite the unchangeable predicted path, is still good for awareness and planning.
Just like a weather forecast of an oncoming storm.
You can't change the weather, but with knowledge, you can make wiser plans to tackle it.