It’s hard enough getting your own code to run and work correctly. When would this be a useful development paradigm?
The idea is that normally each user will see other users' edits as they happen. They are trying to cooperate, not stomp on each other's edits. So long as the merge is reasonably intuitive, it can be fixed manually if it's not exactly what the authors wanted.
CRDT's aren't very good for writing code asynchronously, since you probably want each version to compile and pass tests, and sometimes do code review as well. Git works better for that. But they could be sort-of-okay for pair programming, though it might be an overly-complicated solution and better to use some kind of remote desktop.
For that use case, I can see this being very useful.
I'm not sure which kind of CRDT these are, but since all edits are part of history, as in git, you're not going to lose history if someone DOES inadvertently stomp on someone else's edits.