Their original subtitle still probably says it best: The Creative Music Recording Magazine. Tape Op is about learning how to make great recordings with whatever tools you have access to.
They interview engineers, producers and musicians who are making great recordings. They sit down and talk with them at length and then run long, in-depth interviews. The reader becomes, in essence, the "tape op" hanging out in the studio and learning the trade from the seasoned vets working in the studio.
Unlike most recording magazines, their primary focus is not on reviewing equipment. They want to discuss making art.
Tape Op is about education and creativity.