Yes CPT is a tool!

But what shall I use my hammer with if I dont have something to hit on?

A complete reportoire book in CPT perhaps no thanks. You have to hammer by yourself. Hammer down moves from books, own head or simular. But. I dont see why we dont have for example ECO lines or simular as defaults coming with program or that can be downloaded. If for example one have ECO one dont need all lines and sub variations. It is completely large enough and dont to small either to just have the table moves on every ECO-number.