Wow, you really are a birdbrain...
If you take no interest in the critical pre-flight calculations or data entry - you are not only unprofessional, but an idiot.
If you take the time to check the OMA, you'll find that you do have a responsibility to participate in the preflight activities.
Regardless; why wouldn't you take an interest in quietly observing the important stuff?
When it's too late... it's too late...
Hope you don't ever augment for me.