Following the recent change, when I click "View new posts" it does not show threads that I have just posted in or threads that I have just started.
Having lived with this for a while I am now convinced it would be more convenient if these threads were listed.
For my new threads it would confirm that they had been posted.
For existing threads I have just posted in it would give a similar confirmation and an easy way to re-open in case I want to change what I have just posted (all too common!).
Also the behaviour would then match the description better -- "View new posts" could be expected to show all threads with posts up to the cut off time (which arguably would be better as the time I last clicked "View new posts" but that is a separate issue).