If it's mentally wired, based by the construction and inability in some area, that may not fix how you can feel, and more so cannot fix how you are able to feel. Also, if the root cause is different, and you are using success to cope with it, it won't fix it very much/long term/effectively.
Any accomplishment makes someone better, not necessarily smarter, but more effective and possibly hardworking. They found some use that functions for the smarts that were already there, so, more effective, efficient, and motivated. They exceeded the limit they thought they had, once.
If it's a constant success trail, then you can say there is really not chance, it's for sure about working, learning and changing. A winner is more so defined by multiple wins. A smarter person, is that really a thing? If it can be, then it's about learning and doing things differently. Growing, decisions with better outcomes. Becoming wiser in their life, dealing with their issues better and with others better. But if they truly value success, as opposed to people telling them that it would make them smarter, then pursuing it can be smarter to do.
The motives matter. The way people deal with how the world treats them. How they work and how much they know themselves. Do they make bad choices, or good ones? Are they influenced and trying to prove themselves to others or to themselves?
This is also about how they manage to cope mentally with issues, it's not just about smarts. Like a drunkard has an issue that may be genetic, i cant be compared because the pull towards the alcohol i have isn't equal, and my addiction is inexistent.
If they need help, how and where they find it? Some people are lacking motivation to live, and that may make them decide things that hijacks their life. Can you say they aren't smart? They're just not where they can actually do what they can to help themselves. It is indeed a loss of emotional intelligence but only perceived. We know that depression can be cured, especially if not chronic or from birth, or where it comes in periods of time. So that intelligence is there but awaits the mental disposition to be able to happen and set back in.