My intuition tells me that 78 responses to a Google Forms survey, even on habits, cannot explain the why behind the behavior regarding identity documents.
What motivates people to check their papers months in advance is the lived experience of administrative delays and fear of an unforeseen event.
In Spain, obtaining a cita previa for a NIE or passport can take weeks or even months, and a simple survey does not capture this tangible reality.
To truly understand, in-depth interviews about frustrations and strategies of users facing administration are needed.