Like most of you I saw six on this morning and thought it looked awful - listened to the soundtrack and then saw it in London last year and it is so good! Made me fall in love with musical theatre again, so would definitely recommend going to see it when the theatres are back up and running!
What works with Six is that none of the girls have egos, they work so well together - the understudies and swings are treated like gods in that show, they are amazing (they all cover every part)..
I think Carrie would have an aneurism if an alternate player had more respect than her in a show. She needs to be queen bee, the quirky girl, the plus sized babe who is humble and down to earth.. but in that cast she would be seen as the shallow, self absorbed, privileged blancmange that she is.