I am sure Kelly will feel mightily empowered by your support, A8! (I do think people were way too harsh on her review--but as others have pointed out better than me, she always comes across as fair when it comes to a show, and never makes the presumptious mistake of claiming her view is right and others' wrong, merely what her opinion *is*).
Stage Struck--I believe the rolling harpsichord in Corner ofthe Sky and other parts in the original cast album are keyboards --probably an analogue synth of some sort (like the one used in Company which apparently is now next to impossible to exactly duplicate digitially and all the old models are in disrepair.)
I dig the original orchestrations too, but they are dated, I suppose. The cast album does have many moments that sound very different on record than they do on stage (at least judging by the 1981 video)--tempi, less theatrical delivery, using fade outs, etc--Motown and Phil Ramone (RIP) of course made itvery much like a pop album, even recording it as one with the instrumental tracks done first.
I admi I'm often not too impressed with the original pieces of "journalism" BWW does, but I really liked the piece posted the other day here by Kevin Winkler abouthis memoris specifically in regards to the cast album (and it bridging pop and Broadway) when it came out.
https://www.broadwayworld.com/article/BWW-Special-Report-PIPPINs-Motown-Magic-Returns-to-Broadway-20130403 This surely has been mentioned, but who did the new orchestrations?