J. Larry,

Also being a long-time user, I am sorry to disagree with you that BIAB is only a “practice/learning tool” as it can be so much more.

For me it is:
1) “My band”, which I work with “real time”. It even makes it possible for me to sing “Four Freshmen”-style arrangements, all by myself!
2) Am also using it as an arranger (of mostly jazz tunes) and there a complete song with chords and melody is a very handy “starting point” of any arrangement (pop, folk or jazz).
3) Finally, I also use it to compose on and I can hear different chord progressions “in the flesh” as I work on them.

Hope this can be an “eye opener” to anyone with restricted view of the use of BIAB!
Brgds,
Tonnie