On the surface, the headlines largely speak for themselves. In late October, the total market capitalization of the Magnificent Seven — a group of elite tech juggernauts — jumped past the $22.2 trillion level. Leading the surge was semiconductor giant Nvidia Corp. (NASDAQ:NVDA) , which crossed the$5 trillion valuation mark for the first time ever. In doing so, it eclipsed the entire economy of Japan.At that time, nothing seemed capable of arresting the blistering ascent of NVDA stock. Nvidia CEO Jensen Hua ...