I’d say 75% of requests for meetings I get conflict with something already in my calendar. Nobody bothers checking it before just flinging something in at a time that’s good for them, despite everyone’s calendar being visible to everyone else in the company, and having support for finding a free slot.
> everyone’s calendar being visible to everyone else in the company, and having support for finding a free slot.
As someone who is often trying to schedule C-level people in meetings, I can honestly promise there is no such thing as a "free slot". Eventually, one offers a decent meeting time and let the invitees sort out their own priorities.