We have some messages that we eliminate via an automatic restart during the night (e.g. C disks with warning, SWAP messages).
If we work with acknowledgements and the problem has not been solved overnight, the alarm remains permanently acknowledged and we lose sight of this alarm.
If we work with a downtime until the next morning at 05:00 (which we currently do), we do not notice if the C disk switches from Warning to Critical by then and may prevent users from continuing to work.