Why difficult to define the relation ship of banker and his customer in general?

The relationship between a banker and a customer is complex due to the blend of trust, legal obligations, and financial interests involved. It encompasses not only the transactional aspects of banking but also the emotional and psychological factors, such as trust and dependence on financial advice. Additionally, varying customer needs and the evolving nature of banking services complicate the relationship further, as it can shift from a simple service provider-customer dynamic to one that includes advisory or fiduciary roles. These nuances make it challenging to define the relationship in clear, universal terms.