Based on its UI it seems to pose itself as just a more polished version of the entire Google Calendar UI, so I guess if it's trying to be a full replacement it

Based on its UI it seems to pose itself as just a more polished version of the entire Google Calendar UI, so I guess if it's trying to be a full replacement it probably needs all the permissions. I wonder if Google will suddenly EOL half the APIs at some point rendering it unusable though.