It is very common for engineers to hypothesize (often with limited evidence) that the problem is “the users” rather than the technology and its support infrastructure. I think this can be true, but two points:
1. The high-attrition low-skill workforce at fast food restaurants is a fact of the industry. (I am not endorsing it either.) So if a solution is failing widely when faced with the reality of its users, then the system is flawed not the users.
Of course, you might argue that it’s impossible to build a system that works with this type of users, which leads to:
2. The video argues that failure rates at competing fast food restaurants are vastly lower. While I can’t verify this myself, if we assume it’s true then it’s strong evidence that the problem here is unique to McDonalds and therefore doesn’t represent some systematic impossibility.
I don’t care much about ice cream machines, but in the broader technological sense I dislike “users are the problem” arguments. The whole point of tech is to make users’ lives easier. When other people are doing that and you’re not, there is a problem.