I think they're saying the answer is: Price.

Over here in AgTech land, we focus hard on fully-loaded dollars/acre. For kitchen staff, the metric's probably going to be dollars/hamburger, and a human can sure make a lot of hamburgers for $12/hour.

You might be able to make some kind of (AI + robotics) thing that can replace that human, but at $12/hr that human costs $1,920/month + tax. If you can make a AI+robotics unit for $24k that works perfectly for a year, you break even; if you have a single $1000 service call because it's acting up, you've lost the budget.