Why is a GFCI not used everywhere?

GFCIs (Ground Fault Circuit Interrupters) are not used everywhere primarily due to cost considerations, code requirements, and the specific risk factors associated with different environments. While they provide crucial protection against electrical shocks in wet or damp areas, such as bathrooms and kitchens, their installation in every outlet would increase overall electrical system costs and complexity. Additionally, some standard outlets in dry areas may not require the same level of protection, making GFCIs unnecessary. Building codes vary by region, influencing where GFCIs are mandated.