Nope, IQ is different. IQ is special. IQ can predict the future of someone with striking accuracy. Not all traits of a person are equally significant, that is the point you have missed. Of course environmental factors could definitely prevent an individual with a high IQ from being successful, but IQ plays a major role. IQ isn't objectively everything, but it is still very significant.
Think about it this way, would you adopt a child, if you knew they were at the peak of their existence? Would you adopt a child with anencephaly, essentially born without a brain except for the parts of the brain that control basic life functions, like breathing, etc.? If you want to dedicate your life to caring for a child who will be incapable of achieving anything, that is your decision, but it's definitely something that you should think long and hard about.
Dude this really isnt the subject. Just stop