Keeping doors open, Keeping doors closed

what is it with humans, the need for ambiguity, the desire to keep doors open.
writing 'maybe you will be the one to...' Fill in the blanks.
'no, i'm not much of a writer/skater/dancer, but maybe you will be the one who will make me write/skate/dance...?' Especially the three dots (...) form the open door. What is the writer thinking or hoping the reader will fill in in the place of those dots?
Why is it necessary? For fear of too much simplicity?

on the other hand, there's those of us that keep doors shut - life brings people into our lives, and afraid of being faced with complicating circumstance, afraid of losing the simplicty and clear demarcations we have found, we keep all doors shut. Coffee? Uhm, no thanks. Lunch? Nah (shifting uncomfortably).
Closing off, rather than engaging, seeing, feeling - and clarifying.

Each their own challenge. I'm not taking the moral high ground here, at least i'm honestly trying not to. Both seems to stem from fear. And then Open doors are probably better than Closed doors. More life can flow through.
Is either of them more truthful?