Here's the real improvements as I see them
1. You get a push notification that includes a join button 1 minute before your meetings
2. You always have a heads up to how long to your next meeting, or how long left in your current meeting
3. I can schedule/find time with coworkers in 2 clicks
4. I can see my coworkers timezones
5. I can replace calendly for sharing my availability.
But none of them have to do with Notion so far.