Archer Aviation wants to make flying taxis a reality. But for investors, that reality remains far from certain.Archer Aviation (ACHR 18.11%) wants to redefine urban travel. The company is developing electric vertical takeoff and landing (eVTOL) aircraft -- air taxis designed to cut hours-long commutes into minutes. With sleek designs, bold promises, and partnerships with household names, Archer has become a stock that sparks conversation.But hype is not the same as investability. Archer's long-term vision i ...