I myself went to a gifted high school but never had my IQ measured. My wife is profoundly gifted and our children are both gifted, with our daughter's IQ highly gifted and our son profoundly gifted, even more so than my wife. I'm in tech and my wife is in finance.
For example, I've noticed in myself and others that in an area where I have a particular knack or an outsized "giftedness", it also comes with a corresponding lack or void somewhere else. This is not to mean that anyone is "less than", but rather, no one is good at everything all the time. We need each other, and where I may have weaknesses, you have may have strengths. I can either appreciate the difference that you're better at something than me, be humble, and ask for your help. Or I can hate you and degrade you and belittle you for being better than me, and spend my days trying to be equal or better than you at something you likely didn't "try" to be good at in the first place. You just are. So what?
In your definition, "giftedness" comes with the added responsibility of not being demeaning to those around you. Sometimes "intellectual giftedness" comes at the cost of "social giftedness". That's not bad. It's just different gifts.
Low IQ = gotta work hard and hope for luck to realize your dreams
Low or high doesn't give you any new actionable piece of information, but it is true that an official piece of paper claiming high IQ will open the door to some institutions, it remains to be seen how long it takes to fall out of love with such institutions.
I feel like a more serious/interesting question could be: do you think that IQ measures anything meaningful at all? Or not, I do believe that IQ is complete bullshit.