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In this context, this study sheds light on several problems and limitations in current practice of hazard\u2010consistent ground\u2010motion selection and fragility analysis, focusing on the impact that (commonly assumed) approximations in disaggregation outputs have on the aforementioned risk metrics, as opposed to an exact solution. These issues are investigated for several building classes, seismicity models and ground motion prediction equations (GMPE), for a site in the city of Lisbon (Portugal). It is observed that only an exact (i.e., rupture\u2010by\u2010rupture) disaggregation can lead to satisfactory results in terms of accuracy, when limit state criteria are not structure\u2010specific. 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