This seems dubious to me, except as an example of people adjusting to reality. If an interviewer asks the question: is your current job ideal for you? what are the alternatives:
- You say "yes".
- You say "no".
"No" means you have to ask yourself what job would be better, and why you haven't done anything to get the job; in other words, you open a whole can of worms. And you gain nothing by doing so. It's not as if you were sitting down with a counselor at the beginning of your working life to determine what job is ideal and how to get it.
Personal note: no, I never had an ideal job for me. For a time there was a good fit between my abilities and the demands of the job, at least in my opinion, but not ideal.