I hope this one sentence is all you need to know that people are busy and you have a very small first impression window to win their hearts.
I remember when I was career coaching individuals I would also help people work through their résumés.
A big part of it was remembering how much of the fine line actually gets read before the reader makes any kind of informative decision.
In most cases, people won’t get through the first half the résumé before deciding if they want to make time to even meet this individual. And sometimes saying too much makes the résumé look too complicated and time-consuming to even bother picking it up.
Just as such in an interview, that process of decision is typically over within the first 30 seconds. The rest of the interview is just nurturing the decision they have already made.