The thing that's wrong with Ocado's technology is that it's ridiculously expensive and tailored for huge FC's (fulfillment centers). The problem with that is that it needs to serve a large population base to be effective and that's hard - in dense metros, the driving times are much longer despite smaller distances. In sparse metros, the distances are just too long. In our experience, the optimal FC size is 5-10K orders/day, maybe up to 20K/day in certain cases, but the core technology should certainly scale down profitably to 3-5K. Ocado solves for scaling up, what needs to be solved is actually scaling down.
There are a lot of logistical challenges outside the FC, especially last mile and you need to see the system as a whole, not just optimize one part to the detriment of all others.