You can become mentally locked into a programming language or development tools or an operating system, or to particular approaches to solving problems, too.

Learning something entirely new is more work, as is spending your own money on this given employers can tend to avoid funding career-unrelated tools and learning.

Corporations themselves can become locked into products and solutions and businesses.

Counterintuitively, there can be value in the bungee boss approach in countering this syndrome; of a policy of periodic and scheduled managerial evictions with business reviews and a review of the bosses, and of institutionalizing some instability within organizational management. A Darwinian policy of up or out; where each middle-tier and upper-level bosses are treated as and measured akin to a self-contained CEO and sales rep, and where each is going to be promoted or pushed out.