@Bob: I searched my Biab fundus for a piece with alterations and different chord extensions to show the characteristics of the font – and My Prince was the first that fell into my hands. I agree with you that there could be simpler chord interpretations here and there. I suspect that this transcription was made by a guitarist (I myself play bass, guitar and tolerably piano). The dominant#5#9 chord is easy to grip on the guitar and therefore quite common - and, for me, in this particular tune harmoniously even slightly more logical than the change from Major 7 to Dominant 7. Pianists might see things like this a little different than guitar players.
But in principle I agree with you: Many of the spread transcriptions of standards for BiaB are not always edited properly. I would be very happy about a well-edited implementation of the key standards. But this is a lot of work and also distributing it is legally not without problems.

Bernhard (aka Brille)

Biab/RB latest build, German Language Pak, Win 10/64 Pro, 1 TB SSD, 32 GB RAM. Notation SW Finale, StaffPad, SmartsScore – Playing Double Bass, Guitar, Piano