Is introversion a defect?

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I've been thinking about this a lot lately and wanted to get some insight about it.

For millenia, humans have thrived off social interaction and the things that stem from it. Thus, extroversion and social interaction are rewarded by having sex and reproducing.

It doesn't logically make sense that a potential mate would even be remotely attracted to someone who doesn't communicate all the time and keeps their thoughts to themselves. That's contradictory to what humans are wired to want. It would lead me that the lack thereof, is an abnormality/defect, or at the very least, an undesirable trait. By that logic, introversion would have been weeded out of the gene pool by now, because introverts would not be getting as much sex as their extrovert counterparts.

I'm leaning more to the side of that it's a defect, but want to know what you all think here. If introversion is a defect, why hasn't it been completely weeded out by now?