An aspect’s optimum is what it’s like when the system is most fit for purpose — when it best helps the company achieve its vision and goals. To determine it, ask yourself: “For this aspect, what would best serve the company?”
The optimum must be practical. The system operates in a specific business and technology landscape with constraints, expectations, and obligations. Even with ample time and funds, there’s a limit to what would be practical. The optimum must also be relevant. Even if you draw inspiration from industry stars, what does your company need from your system? What would matter most to your company’s success? That ideal might not be perfect, cheapest, or fastest.