My opinion of Carvana or other "all online" dealers is that they are focusing on the near new models that they can turn quickly, without having to use "Salesmanship" to sell to save labor and commission. This kind of "software like" approach they are trying to sell to investor is that you only need very few R&D for business and it can scale like a software company, no need to hire more people to sell more car once you build those vending machines. That means those cars have to be cookie cutter commodities.
The problem they have is, we have a shortage of any car, so there is no way they can scale like a software company, and therefore more like a hardware company with chip shortage. The VC funding is also drying up and they will have problems soon if they got cut off and have a runway problem.
They also do not have a moat on their business model. Anyone can do these self help like new commodity retail business. Rental car companies can do it themselves, new car dealership can do it, Tesla can do it, Amazon can do it.
So, what's the incentive to invest in Carvana and what they bring to the table in the long run?