My wife is the same, I get anxious making a sandwich for her as the line between not enough and too much mayo is capricious and she overreacts unpleasantly. That Showey stuff is better, she is fine with a normal dollop of that. Maybe the restaurant chain needs to switch to Showey, sounds like a practical GOP gun policy solution.
The gun nuts would say the solution is ready to use hand guns for sandwich makers with some training on how to use the weapons. I'm in favor of unlimited easy to reach guns at all Trump and DeSantis rallies. Sandwich shops carry should be illegal with heavy jail time if you get caught.
Either that or bulletproof glass between sandwich preparer and gun-happy customer, along with a security detail to drive the employee home to a safehouse at an undisclosed location.
I think taking the proper defensive stance when serving the customer is also advisable. I've never been to a Chick-fil-a but I think they could develop a Chick-fil-AK?