Once you are proficient in a skill you tend to use it again and again. You become less inclined to learn new skills, use new concepts and try new tools, because you know the ones that worked. You are like a hammer seeking nails. But to be successful long term you need to keep and eye on the new skills and tools. When the problem is a screw, a hammer is not going to be effective.
Lateral move increases job satisfaction. You learn new skills, have different perspectives, build new relationships, and add variety into your reseme.