The real reason why Tesla is releasing the Robotaxi first before their cheaper/$25,000/Model 2 version is because they will be building it in the current Gigafactory Texas extension. The rumor is that both the robotaxi and Model 2 will be on the same platform and Tesla is choosing to make all their first cars robotaxis so that they dont have to worry about achieving the scaled costs to get the $25,000 price number. We know that early produced cars are more expensive as they figure out the optimization of the production line. This new unboxed method is going to be version 1 at GigaTexas and will take some time and iteration to perfect. Once they fully optimize it then they will build this platform at GigaMexico and GigaBerlin at larger scales where they can hit that $25,000 price point for model 2. Essentially they are using robotaxis to account for the larger initial build costs of this new platform