Yes and no. Most people, if they're pretty satisfied at their current job, won't seek out other opportunities, even if ones exist out there which would plausibly be incrementally better than their current job. And they'll tend to be more pessimistic about the qualities of other jobs.

Sometimes, an undeniably amazing opportunity falls into the lap of someone who is overall quite happy at their present job, and they quit that job. But that's a fairly rare case.