JJJ,
I suggested User Tracks in my reply to Lazarus...second reply to this tread.
No, a musician does not have to know or have BIAB to do User Tracks. They are not complicated to make, once you do one. I have compiled one (with pipeline's help). recorded by a gentleman from Fiverr. He never heard of BIAB. Came out from first try. It was just a short, simple thing that I needed. So instead of making him play something particular, I decided to do a User Track, so I can change things if I needed. You can try it:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=609080#Post609080

Personally I think User Tracks have Huge potential. Why? Because if you find the right boys or girls, it can happen within days and be specific to your particular needs. And consider this... unlike traditional genres, Cont.Pop relies heavily on synths. If musician can do it once, they can change things relatively fast, unlike acoustic or electric instruments.
Also, there are great thousands of contemporary genre midi things, paid and free that can sound as good as your synth is, which can be incorporated in BIAB arrangement.

PG music has deep connections in music world, and seems there is a hint of commitment to do Pop oriented things. Hopefully we will see them in a form of pack or a set.

P.S. One last thing. I had requested it in the past (RT request section), but since this grew to something more than just simple "wish", I will add this: I believe it is a good idea to add a straight rhythm, non jazz or soloist Brass / Woodwinds tracks that can be used for Pop music. While there are some very cool winds available, I find choices suitable for Pop very slim. Brass/Winds are special instruments, that are very hard to "program" they need to be played. Just saying smile