Even if cards weren’t linkable without titles (which would be completely reasonable), many of my personal use cases for this topic are solved with card hierarchies instead of titles.
For example: jotting down a quick 2-bullet summary from a conversation with Joe, then making it a child of Joe’s card. If I regularly talk to Joe, it seems like pretty useless overhead to add the title “Quick Conversation with Joe” to each of those notes.
This seems like a pretty idiomatic use of Supernotes and would ease, for example, not having daily notes to dump random things like that into.