I think it depends on the state you're in and the inventory of the car you're buying. Some states have already implemented strong consumer protections that would have encouraged this style of transaction and eliminate many of the mechanisms where it could go wrong.

Further, in the last two years there have been a strong demand and low supply for vehicles. Many dealerships were selling out of cars months before they were even delivered - meaning they're bought sight unseen. Finally they get marked-up 10% or more. So even the cheapest bid is still well over the sales price established by the manufacturer.

Source: Bought a car in 2021, did a lot of research.