I find pretty much the opposite of your entire set of observations. I find that the vast preponderance of the time, if you find that a person has one of these lefty positions, they have all of them, and you can predict the entire buffet from the one. Guns, abortion, feminism, taxation, religiosity, "The Science," global warming, "Democracy," etc., as well as the topical issues and events of the day--Kavanaugh, Rittenhouse, electoral college, bump stocks, masks, vaccine mandates, Ukraine, etc., are all part of a package deal. This is why the NPC meme exists, because these people seem to be updated simultaneously from some mysterious central source, then go on to parrot the same talking points ad nauseum.

People like Vaush are outliers. Though clearly and safely in the Lefty milieu, he has a large contrarian impulse (in his case, most likely born of his extraordinary arrogance, narcissism, misplaced aggression, and desire to fight people still, even when he has no proper enemies on the field). A prominent YouTuber is going to be far more likely to exhibit these impulses than your garden variety lumpenprole, NPC, or apparatchik. But prevalence is relevance, and the celebrities are not the norm.