I guess that's true.
Flower heads and some seed pods can absorb or hold water with either ripe OR unripe seeds.
And seeds will dry faster if removed from the head or pod containing them.
But if you have the luxury of not worrying about mold, it can be easier to clean seeds after letting them dry very thoroughly in their seed heads or in the pods. Trying to get viable, non-moldy seeds is easier if you don't have to play games like wringing water out of a flower-head and then pressing it between towels prior to "drying".
