I think it helps that, at a point in the show where it’s very obvious that the cast are strictly colleagues who show up for a few months every year to film, Jennifer and Sutton are genuinely lifelong friends who remain delighted by each other. I hope the producers don’t ruin it by forcing them to performatively fight with each other.
I’m quite fascinated by the Tilly sisters in general. They have such a wild back story. From growing up in insane poverty with an abusive rapist step father to both becoming Oscar nominated actresses with wildly different personalities. (Her sister Meg has kids with Colin Firth while, as mentioned, Jennifer nursed Simpsons co-creator Sam Simon through terminal cancer and wound up quite ludicrously rich!)