Comprehensive and Detailed Explanatio n:

Parent-country nationals (PCNs) are often used in conservative or centralized cultures where control, consistency, and alignment with HQ policies are prioritized. Large financial firms typically prefer PCNs for trust, governance, and standardization.

GPHR Study Guide Extract -- Global Talent Acquisition and Mobility / Staffing Approaches:

''An ethnocentric staffing model commonly places parent-country nationals in foreign managerial roles to ensure alignment with the organization's home-office practices. This is especially prevalent in highly regulated, conservative sectors such as finance and banking.''

Other models like polycentric or geocentric are more aligned with flexible or mature international companies.