https://alp.consulting/long-job-tenures/
Long job tenure can be viewed in both positive and negative lights, and its impact can vary depending on the context and individual circumstances. While there are potential drawbacks to long job tenure, it's essential to recognize that these effects may not apply universally. Here are some reasons why long job tenure might be considered detrimental in certain situations:

Skill Stagnation: Long periods within the same job or organization can lead to skill stagnation. Employees may become comfortable with their current skill set and resist adapting to new technologies or methodologies. This can hinder professional development and limit the individual's marketability in a rapidly changing job market.

Lack of Diversification: Remaining with the same employer for an extended period might limit exposure to diverse work environments, industries, and perspectives. Professionals who change jobs may gain a broader skill set and a more comprehensive understanding of different business practices.

Reduced Adaptability: Long-term employees might find it challenging to adapt to new work cultures, management styles, or technological advancements. Adaptability is a valuable trait in today's dynamic work environment, and employees who stay in one place for too long may struggle to cope with change.

Limited Networking Opportunities: Building a strong professional network is crucial for career growth. Individuals who spend a significant portion of their careers in a single organization may have a narrower network compared to those who change jobs and interact with a diverse range of professionals.