"Block on calendar" is the most helpful feature in notion calendar. Its so easy to block privat events on other calendars. Just to give you an example. If you have an event like "get child from daycare" its mostly in your working time. If you could block this event from the shared calendar with your wife automatically as "busy" to your working calendar, no one of you colleagues will ad an appointment in this time (especially if they do not use morgen instead of outlook).

Block on calendar is my number one feature why I'm still using notion calendar (cron) as my main scheduling app. (For daily work and tasks its morgen) :)