Like other restaurant chains, Sweetgreen Inc. is exploring automation, in its case with its Infinite Kitchens that use robotic technology to assemble salads and bowls. But Morgan Stanley analyst Brian Harbour isn’t sure the concept will translate easily to green for investors.“Increasingly the story feels to us like a bet on the Infinite Kitchen rollout, and whether this falters, or drives a real step change in economics and the unit development opportunity, which is needed for the stock to work, in our vie ...