It would make things extremely complicated and unfair, plus the judges would no longer be 100% objective. Plus, songwriting is not something you can teach, like correct singing technique (The Voice, AI) or modelling (ANMT) or whatever they do at Drag Race. It's a more complex, inner process.
There will be one challenge that is similar to the concept y'all are discussing but not exactly the same. That is at least 5 weeks away though, so breathe out breathe in
People are generaly fuming a lot in this thread cause competition is stiff. "Breathe out breath in" is my favorite phrase for them, it's simple and effective