Furthermore, by doing it promptly, you’re keeping a short to-do list. The “loop” between what you wrote as a “fleeting” note and what gets turned into helpful long term information is a lot tighter- you have the instant feedback of “this didn’t turn out to be as useful as I thought it might” or “I actually need to bring in a lot more information for this to make sense”.
Be timely in the process of converting from quick note to permanent note.