Festool would need a lot of robots to do all of that assembly. The amount of pick-and-place operations and the various end effector tooling needed boggles the mind. This is a circumstance where people are far more efficient, and faster, than robots. As has been noted, flexibility is easier to accomplish with people. When volume is high you add people to the line. If demand slows down you can just use fewer operators but with each doing more steps in the process. The extra folks can go where demand is higher.
Festool uses some very sophisticated and modern machines for manufacturing component, pretty much the opposite of Starrett as observed in a different thread, but the skilled folks are the assemblers who also act as in-process inspectors.