This seems so obvious, I am not sure why it was set up differently by design.

Nice that we can change the calendar on some events received (but not all!!!) but if I receive an event in one calendar I expect it to show in that given calendar, default colour coding included.

Some calendars might be shared, some linked to accounting etc, if an event is received by x it should show in x.

This is a big risk for privacy and business resilience as well and a big loss of time cleaning up for each event coming in one by one.