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Everything We Know About Neuralink’s Brain Implant Trial
(www.wired.com)
This is a most excellent place for technology news and articles.
It's because he does things that sound cool to him and doesn't handle any of the engineering when it's too complicated and thus leaves all power to actual professionals
SpaceX does fine because he's minimally involved, as does neuralink. Tesla he's ruined through his involvement but only barely (the stupid touch-based yoke and no lidar, for example).