One maintenance department can maintain dozens of robots if we’re talking about a medium+ size facility.

One of the major benefits of industrial robots are that they can operate 24/7. That means 24/7 staffing, and on call support.

One single tech will not be able to do that effectively unless that is literally their only responsibility.

Maintenance specialists like that are very common budget cuts, so they often have to do 2 or 3 additional jobs.

Now the robots are left with new people who are all learning on the fly. They often have no robotics experience but are the only people who accept the low wages typically offered. Now the company needs several electrical engineers to deal with the automation, and process engineers to try and “optimize” everything so it’s easier for the remaining workforce.

All of that is very expensive. It tends to be cheaper to just staff maintenance properly.