A technician is someone trained to perform a set of procedures. Performing a procedure on a technological thing is not the same thing as understanding the technology.
For example, anyone can enlist in the Air Force and in less than a year, become an aircraft maintenance technician. The job involves following prescribed test procedures, then turning bolts and screws in the proper direction to replace the parts that the procedure says require replacement. Job qualifications involve basic mechanical and deductive reasoning, but most importantly a capacity to follow directions. It's superficially impressive that technicians get to work on the most technologically advanced flying killing machines in the world, but really it's mundane, uncreative work that's been developed and documented to be as simple as possible so any grunt can do it.
But a technician is not an aeronautical engineer. The engineer will hold a higher degree, get paid more, have a deeper understanding of how the aircraft works, get to do creative things like design new aircraft, and create the service manual that tells the technicians what to do. One can't simply show up at an Air Force recruiting center and become an aeronautical engineer: it takes years of school, then even more years of job experience to be successful.
Most "technician" jobs don't even involve repairing things. A lab technician might spend their time loading fecal samples into a centrifuge, for example. Don't let the lab coat fool you: this is not highly advanced work: it's putting turds in tubes, loading them in a machine, and pressing a button while ensuring the labels don't get mixed up.
So "technician" as a license class implies just what it is: the lowest possible qualification to operate amateur radio equipment. The technician exam is much more about operating procedures than it is about understanding how radios work, just like the lab technician's training is much more about how to spin turds really fast than it is understanding the biochemistry to develop a colon cancer treatment.
As for amateur extra, the inclusion of "amateur" shouldn't diminish anything as all the classes in question are classes of amateur radio license. As Glenn W9IQ notes, "amateur" is included in that title mostly for historic reasons. And as ASzy notes, "amateur" means unpaid, not sub-par.