I've been wrong many times before but still have trouble believing this would be more efficient than just having two separate buildings. Even in places where la

I've been wrong many times before but still have trouble believing this would be more efficient than just having two separate buildings. Even in places where land is very expensive. How many dark stores would you have to run in a city like Boston to get the same efficiency you could get from a signle warehouse with a similar system to this?: https://www.youtube.com/watch?v=ssZ_8cqfBlE https://www.youtube.com/watch?v=ssZ_8cqfBlE And if you insist on doing that multi-use concept - it still seems like a robot on wheels and with much different than human arms would be more efficient.