I am allergic to the glitter side: a study on vacation habits is not enough to prove the reason for identity document checks. Just because people plan ahead does not mean they verify their papers for vacations; administrative compliance or significant cash flow are often the real reasons. The 78 responses are an observation, not a causal proof for these behaviors, especially when 25% wait until the last minute. For example, in Luxembourg, the validity of documents for cross-border workers is a daily legal constraint, not just a traveler's whim.