The problem is that Bowen Yang can only really play one character so you're seeing the same thing over and over again.
I mean, I think he's got a bit more range than you're giving him credit for. Even recently, his Vance and Charlie XCX were different enough. There's more to playing character than voice work.
Hell, Kenan is always Kenan no matter who he plays. And it doesn't matter since he's a pro who's got it down to a science and delivers laughs regardless.
Jane Wickline was awful. Her for Chloe Troast was a real trade down.
Her song at least had a very clear "game" to it and was easy to follow from a comedy structure. Not great from a performance standpoint (same goes for the waterslide sketch, which she may have written....featured players usually don't get prominent roles early on in the season unless it's stuff they've written).
But, if she can write, she may stick around for a little while -- almost seems like the inverse of Troast, who was a strong performer, but didn't seem like she could write much so she didn't find herself getting used very much.