Sector complexity changes the model architecture itself, the revenue recognition logic, the cost drivers, and the capital structure. Biotech requires epidemiology-based revenue models and clinical-stage probability-weighted valuation. Cleantech requires project finance structures with capacity, offtake, and debt service coverage analysis. SaaS requires cohort-based revenue modeling with churn, expansion, and LTV/CAC analysis. Manufacturing requires working capital modeling specific to inventory turns and supply chain dynamics. In each case, we build the model architecture around the sector's actual value drivers rather than adapting a generic template.