If you search for a tutorial on how to solve the cube, there's a 99% chance that the tutorial you find will tell you to start solving the cross first.
In the same sense that Roux is just CFOP but ignoring the M-slice until the end? And CFOP is just a structured form of Petrus but you delay the EO step until LL? Or in the sense that you just do EO-first CFOP and don't actually use ZZ.