Having financial security and feeling like you have financial security are quite likely to be two different things.

The latter is more subject to the hedonic treadmill of "financial security means I don't have to change anything about my current standard of living" as opposed to "I don't have to live on the streets or worry about where our next meal will come from".

I could stop working today and we'd eat and live for the next 50 years just fine. It would absolutely be at a dramatically reduced standard of living. I think I have basic financial security, but many people (myself included) would answer a survey that they don't feel totally financially secure.