Rivian is a high-risk asymmetric bet: the only US company mastering in-house EV design and manufacturing, with licensing deals to traditional automakers; if the narrative and government support align, it could 10x–30x despite a high probability of bankruptcy.
Treasuries offer safety and a more attractive upside/downside ratio today given market heat; being over 50% in Treasuries is a defensive stance that reflects the reduced potential for further huge equity gains.