Some interesting mentions of imposter syndrome, which I feel is natural to some extent. There is only so much the interview process can achieve, particularly if you don't have the stamina/time/inclination for some of the longer processes (I think Google used to have 7 interviews for some of the roles relevant to my field). You are also relying to an extent that the company is interviewing you properly to gauge your suitability, which can prevent you getting into a role you cannot perform, especially as you won't know every factor at the point you may accept the position
With imposter syndrome, I think the key questions to ask yourself are "Can I succeed in this role?" and if so, "What do I need in order to do so?", and with that in mind "How likely is it that I will succeed?".
Mind you, there are plenty of people who live off that - we've recently let a couple of evangelical blag artists go, one of which was literally waiting tables (not that there is anything wrong with that, but - relevancy) before joining us on a package well into 6 figures, and then clinging on with their fingernails before they were found out. They then update (and inflate) the CV and rinse and repeat.