Or is your target audience only your own ears, and you never plan to publish or even compare your work to others?
If all someone can manage is "barebones song writing" without great lyrics, harmonic interest, or melody, they need to either be in a fantastic band or give up.
Having played music nearly all my life, songwriting included, and soaked up almost every bit of music-making tech in the process, I'd wager we won't see AI delivering better results more easily and, importantly, with the flexibility of Band in a Box within the next year.
The playing/performance part of making music is a solved problem. You can do this with DAWs and plug-ins today. The truly hard part is coming up with the ideas. That's where AI has an opportunity.
If I'm missing something about BIAB, let me know!