> delivered a project very fast with X,Y and Z and saved the company $100mil

The problem is that $100mil is all pixie fairy dust when you're working on a new project. I wish this wasn't true but it works out better for you to implement it as costly and complex as possible, show off how smart you are, then simplify it during a cost cutting initiative (wow they must be so smart to make such an obviously complex system so simple).

The secret is that while you think you're getting away with something playing this game you're actually doing exactly what the business wants.