The Chinese electric vehicle maker remains a divisive stock.Nio (NIO -1.68%), a leading producer of electric vehicles (EVs) in China, was once a hot growth stock. Its American depositary receipts (ADRs) closed at a record high of $62.84 on Feb. 9, 2021, a 10-bagger gain from its initial public offering (IPO) price of $6.26 on Sept. 12, 2018. At the time, investors were impressed by its explosive growth, expanding vehicle margins, and unique battery swapping technology.But today, Nio's stock trades at less t ...