With all due respect, you are looking at the finished product of those employees without consideration of how they got there. Nobody said home schooled kids or private school kids can’t adjust - eventually - to the real world as well as public school kids. But if that adjustment is delayed to a later in life period than it would normally happen, it can be both socially and economically detrimental to their lives. Talking about lost early career income opportunities, poor job satisfaction, early adulthood relationship / marital issues, and other struggles here.
Ultimately, its less about the schooling method in particular than it is about general exposure to people from different backgrounds and interests. EVERY child needs to learn, at the earliest age possible, how to interact with other kids who are not from their same neighborhood, church, rec sports league, etc. That’s not even remotely up for debate. The simplest and most straightforward way for this to happen is by enrolling the child in a public school, but it isn’t the only way. External activities like Boy Scouts / Girl Scouts, volunteer opportunities, early life employment / summer jobs are other ways.
The biggest problem is too many parents who go the home school route do so out of a larger agenda of insulating / protecting their children, and controlling all their relationships. That always does way more harm than good. We’ve all seen it, especially in the south. Kids not allowed to hang out with or date other kids from outside the same church (or church in general), overly strict curfews and micromanaging of social life and activities, and so forth. Homeschooling and private schooling, when done for the right reasons and within the proper scope of a child’s development, are both very good things. But they aren’t always done for the right reasons.