Which of the following is a potential drawback of traditional authentication methods?

The drawback of traditional authentication methods that stands out is the increased security and management complexity associated with passwords. Traditional methods typically rely on passwords, which can create several challenges. Users often choose weak passwords or reuse them across multiple sites, making them more vulnerable to breaches. Additionally, organizations must implement policies around password complexity and expiration, requiring ongoing management and user education to ensure compliance. This complexity can lead to user frustration and may encourage practices that undermine security, such as writing passwords down or using simple combinations that are easy to guess.

In the context of other options, while increased user involvement, reduced access flexibility, and more robust application security can have their own implications, they do not encapsulate the significant complexity and risks that come specifically with managing traditional password-based systems. The potential for security breaches due to mismanagement or poor user practices with passwords underlines the key concern with these traditional methods.