Robots might solve Chipotle's portion complaints. But there's a big reason they won't replace humans — yet.

• Chipotle customers have been complaining about smaller portion sizes.
• Robots could solve that issue, but they would take away from a key Chipotle experience, analyst says.
• The ability to ask an employee to tweak an order in person is highly valuable, the analyst told BI.

Chipotle is once again facing accusations of skimping out on portion sizes, and while robots may seem like the obvious answer for consistency, they may not be the best overall solution for the restaurant, an analyst told Business Insider.