when DA says trash (2015 page 128-129) he means completely eliminate so it is not something you are having to worry about
of course it is possible to have a change of mind. this would require going through the workflow steps beginning with capturing the same or similar item
Regarding all your other points, which are really to do with next action, which is having sufficient information to know what doing looks like (page 306). This is the reason why some are non actionable because there is not sufficient information to put them in the categories DA identifies namely 1. time specific or 2. day specific (2015, page 43-45)
