If you really want to make a pop hit, the arrangement of your own chords (what BIAB does) is only ever going to be a small part of the process.

I would recommend Songtown.com for anyone who wants to learn the reality of what it takes to find concepts and lyrics that will cut through and get cuts by artists.

That's if you want to make actual songs.

If you're making electronic music with no lyrics, just the occasional "Ooh yeah baby" from a sample collection, much more of that process is automatable but that is dance/edm territory which won't feature in mainstream pop or AC (adult contemporary) charts.

And, of course, dance/edm is an equally valid form of musical expression!

Actual SONGS will always require substantial human creative input.

P.S. Most pop hits now have multiple (human) writers. Many more than used to be the case so now, in the contemporary pop industry, it takes more people to write a hit, not fewer! I don't think we need worry about being replaced by machines.