Comment by nashashmi

To all those people throwing doubt on this, you are highlighting a situation where there are a dozen downturns in a career. Better people last longer.

People who switch more often however ladder up on their skill sets. Taking a diverse number of approaches that change from place to place and adapting nicely to them all and maybe even bringing a few skills from elsewhere to help in their current job.

A comfortable job makes you stagnant. Movement is good. Even within company.