I dislike the terms, muscle confusion, and shocking.
I think they portray an unreal sense of what you can, or need to do.
I try to always remember a few basic rules, and train by them.
Keep it simple
Progression is king.
I find that as I learn more about what I'm doing I use fewer moves overall. It's the quality of how you use the tools in your toolbox that makes a difference in your end product.