We've added a new feature that merges posts made in quick succession, to help tidy up threads where members make their replies over multiple posts:

New posts will still trigger alerts/notifications as before. Right now we've set the timeout for the feature at an hour, but will revise over time.
There's an exception set for the first reply to a new thread

New posts will still trigger alerts/notifications as before. Right now we've set the timeout for the feature at an hour, but will revise over time.
There's an exception set for the first reply to a new thread