What specific concern might external reviewers have regarding a candidate with a very long tenure in a single role?

Answer

Wondering if they possess the breadth of experience of someone who worked at multiple companies

External reviewers might question the scope of experience, wondering if fifteen years in one place provided the breadth of navigating different management styles and technology stacks that moving between three companies might offer.

What specific concern might external reviewers have regarding a candidate with a very long tenure in a single role?
jobemploymentcareerdurationLongevity