I am sick of seeing people throw away exercises because they can't combine them. This integrated approach allows you to pick the right tool at the right time for the right person - every single time.
Let's talk about barbell knurling. How does it differ between barbells? How does it affect different lifters? How do you prep your hands to deal with it?
The killer app is that one application you can get from a piece of equipment that you can’t get anywhere else. Don’t waste your time doing things that for which that tool is not designed.
Barbells have a much younger history than we've been led to believe. They are also quite limited in design and application, and take up more space and money than is economical.