Well thats fine for the technician. Some folks try to grasp the big picture and understand the science behind things. It doesn't make it any less valid. NASA engineers used classical newtonian mechanics to send Apollo to the moon. I suppose you are not a fan of Relativity either?
Not just the technician. Electrical theory, as science, has not been particularly advanced by the QED. After all, it is concerned with electrons, not the quantum stuff.
I have no problem with relativity theory, actually I think that that theory meets Popper's criteria for a well stated theory quite well.