Agree. I read with interest why there are people with difficulties finding employment. I could very well be wrong but my take is:

1. Employment history too diverse. Too many disparate jobs in the past and Not enough years in a single type of job

2. Past jobs did not demonstrate job growth. Impt to ensure job responsibilities increase either vertically or horizontally with every new job

Humble opinion is if you belong to either group then try not to quit without a job because it is more risky

However if you have enough years of experience in same/similar roles in well known companies, your risks are somewhat lesser though not immune.

But this is not the same to say once you r out of job you r out of the race. Luck plays a v impt part too