I think this season's been frustrating for Sansa because they're basically setting her and Arya up to be the new shadow council sort of characters in the world to come. Basically, I think they're going to have them provide the things that Daenerys and her army are hilariously bad at: soft power and subtlety.
I guess you could say she's becoming a "good" Littlefinger, though it's a bit reductive.
At any rate, it's one of those things like the High Sparrow plotline that's sort of frustrating to watch in-progress because it's more about the destination than the journey. Like, let's be real, 90% of the Sept/High Sparrow scenes were absolute trash in a vacuum, we just remember them fondly because the conclusion to that arc was so good.