I guess it lives on since enough people have some vital QuarkXPress workflow they can't abandon...
It seemed like absolute magic at the time to me and my friends - from my PowerBook on the couch, we could change the song playing on the iMac on the other side of the room! Wish I still had that source code to look at.
Remote events even worked across AppleTalk and TCP/IP, across macOS and Mac OS Classic, so you could make use of some of the features between computers on different networks, with 10+ years difference in software, and it would still 'magically' work.
After RAOP and mDNS etc. the event system was less used and most of the newer features are implemented as classic client-server applications. But it still exists, and still works. Apple Events are even advertised over Bonjour!