Regarding Digit as a competitor: The cost will be higher: you...

Regarding Digit as a competitor: The cost will be higher: you need more off them and they are thinner and slower and need to make much more movements. Each of these creates higher running costs. To make them work together increases development costs even further then the problem of having to manufacture many. They have to move their own power source around (unless they are wired) which makes them inefficient. They are top heavy with load up high and cannot build multistory buildings like the crane version of the HX, I doubt they could built to full ceiling height.