Here's the good thing:
When you have a bunch of notifications you can snooze them for 5, 10, 15 minutes, 1, 2 hours etc. If you snooze a single item for, say 15 minutes, then when it pops up again 15 minutes is the default. If you multi-select them all and then snooze for, say 1 hour, then when they are displayed again it doesn't default them all to 1 hour, but 10 minutes again. I think this is a good thing, because it makes you think about how long to snooze each one, rather than constantly pushing them into the future. You may not think it's a good thing.