If you're forgetful like me, it's really helpful to be able to check what time the first meeting is tomorrow when I set my alarm before bed.

Now that work from home is a thing, I also like having an standard way to communicate with work and be at least partially productive in case my laptop dies. I have my Do Not Disturb settings set so that the work profile doesn't show me email or chat settings outside of work hours on weekdays so I can start email triage during my morning bowel movement if I want, but it won't nag me if I'd rather spend that time in quiet contemplation.