In-between jobs you are stressed to find the next job, that's not a good background for vacation.
It's not in-between, it's unemployment.
What the OP likely meant, is leaving a gap between leaving a job and starting next one. It's usually easier to push employment date by a month than getting a month-long vacation after starting the job.
This is what I ment. But I also realized that most people don't have the luxury of unemployed money which makes changing jobs way less risky generally.
That was trivial to do in ~2019, when one could quit a job today and be sure to find another one next month. Today, not possible.