Patti has done only 4 musical revivals. SWEENEY TODD, ANYTHING GOES, OLIVER!, and THE BEGGAR'S OPERA. I doubt that you were alive for THE BEGGAR'S OPERA, and you were certainly too young for OLIVER! - plus it ran for very few performances. So that leaves one, maybe two musical revivals that you have seen her in. You were probably around 4 years old when she was in ANYTHING GOES.
Bernadette was also in 4 musical revivals. GYPSY, ANNIE GET YOUR GUN, ON THE TOWN, and THE MOST HAPPY FELLA. There's no way that you saw the last two. You've seen Bernadette re-create exactly 2, maybe only 1 role.
I don't see why this is a problem. Sure, new material is exciting - but as long as immense talents like Peters and LuPone are re-creating iconic roles like Annie Oakley, Mama Rose, Mrs. Lovett, and Reno Sweeney - what's the problem?
And no, THE RINK isn't an iconic role, but it's a show that's not done anymore. Who cares? What's the harm?
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson