Because repairing PCs IS easy. I am speaking from experience as well. I still repair PC's and I know plenty of people are really dumb about it. PC's and Macs actually.
Repairing a PC is nothing to say writing a 3D software simulation program using Delta3d, including the proper physics for all the vertices so that actors and players in the simulation match up correctly. Do you know the kinematic math I needed to do to get all that working? I have to take relative vectors of everything, matrix transforms of the global x, y, z coordinates, redo everything back into relative x,y,z coords. That is all done 60 times a second, and that is just the tip of the iceberg.
Or coding new features for a Sharepoint site based on really vague requirements. Sorry PC tech is just that, entry level. It does take more than "average" high school brains that are all that are required for burger flipping. Of that there is no doubt. But it doesn't take much more than that I can assure you.