It is not hard to know if a machine is broken. There is an entire map dedicated to this, which shows state-wide broken rate as high as 40% for some states.
If you know these machines are broken and they are not being fixed, what use will be to know what machines will break in the future? This is not a technology problem, this is a business and people problem. Another case of companies using AI to garner positive marketing, instead of improving their service and customer's experience.
Sensors on the equipment seems reasonable to me. Predicting failure in advance can avoid downtime or more costly damage. Machines with degrading performance and some underlying issue can also be a food safety issue, if it isn't addressed until they entirely fail.