So instead of just going through http://ftp.rpm.org/max-rpm/ http://ftp.rpm.org/max-rpm/ and learning how to make RPM's, the author continues employing all this

So instead of just going through http://ftp.rpm.org/max-rpm/ http://ftp.rpm.org/max-rpm/ and learning how to make RPM's, the author continues employing all this complex technology, because why keep it simple when it can be ultra-complex, hack-prone and Dockerized with a gratis footgun to boot? Makes perfect sense!