Agreed with most of your post but uhhhhhhh

That’s why in the real world people who are very convinced of themselves and their own ideas will get far even if not gifted at all

Confidence isn't as good for finding the truth or good solutions as it is for tricking other people's brains into thinking that you're a reputable source of information. If you mean "will get very far" as in "capable of raising through the ranks of a hierarchy, regardless of what they actually do with their position later" or "capable of establishing their own little flat-earth cult", then sure, a confident dumb person can achieve that. Not sure that's something to be celebrated though.