Why is not interference for calendar like default calendar app.
For me is problem - missing join other people to event. I creat event from Agenda, then open calendar and edit this event… pfff 
Alas, as much as we would want to add this functionality, Apple’s frameworks that we use for the calendar integration don’t allow this at the moment, same thing for adding attachments for example. It would mean that if we would want to add this, we’d have to entire implement calendar integration ourselves, talking directly to iCloud, Google Calendar, etc. While there are benefits of that approach it’s a monumental amount of work and other things are then simply more important to work on. Hopefully this gives some insights into why some features are and others aren’t part of Agenda at the moment.
