A brilliant technology isn't necessarily the basis for a profitable business.There are good stocks, and there are great stocks. And then there are life-changing stocks -- those like Amazon and Apple, both of which soared in response to those companies' revolutionary products and services. Yet, such stocks are few and far between. It's also not always clear a company is a game changer until well after the fact.This complicated dynamic is making it tough for investors to make a decision about Archer Aviation ...