Glad you found that interesting! One warning I can add is that if you do decide to add a "no-integrity" type purge and if you've never run one, depending on how many messages you have you may trigger a very large purge (and a lot of journaling activity as a result). Often times when making significant purge changes, it can be safer to increment the time period you are purging bit by bit to make sure you're not asking too much of a single purge.
ex. If you run daily message purges then every day you are purging 1 day's worth. If you have "expired" messages going back a few years and decide to purge them all of a sudden, that might be a surprising number.
On a bit of a tangent but I might recommend reviewing the following post by my colleague and considering whether a 2 phase purge schedule would make sense for you. One purge task running as standard to clean up the completed messages and one running on a lag to catch any suspended / leftover messages that are old enough that you think they could be removed:
Try "Starting and Stopping External Servers":
s st=$system.external.startServer("%Java Server")