If it weren’t for Lady Gaga’s involvement, Tony Bennet’s swan song might go virtually unnoticed by the younger generation, probably a footnote in the media, and his type of music would still be just a relic your grandparents listen to.
However you rate her talents, her contribution to perhaps introducing a younger generation to songs with more than three chords and a looped structure may pay dividends in the future. Modern music has almost hit the wall with regard to harmonic simplicity. Exposing youngsters to more complex chord structure may tempt one or two to play a bit more outside the relentlessly diatonic world pop music has become.
If that happens, she deserves as much respect as we can give her!
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An arranger is just a tool. What matters is what you build with it..!