Why is synchronizing calendars such a pain
For about 10 years I am in the Apple ecosystem and never ever found a way to synchronize my calendars in a neat, more or less intuitive and straight-forward way. Sometimes -after hours of trial and error- the synchronization between my Apple devices works .... until the next software update of IOS or MACOS. Then you know you have to start all over again to check which calendar data has been corrupted or is missing. Not to mention the events that occur 3 or 4 times in one day in 2 or more calendars.
I am using an iMac, iPhone and iPad and to be compatible with non-Apple devices I also use Google Agenda.