Hahaha it's a swear jar episode
But yeah, I'm really impressed with how they've managed to retain Trixie's character post-redemption. She's still thoughtless and egotistical, but there's more to it than that now. Same with Starlight, and really same with Discord for that matter. They all could have become bland carbon copies of each other, but the writing team has been able to keep their distinctive voices while changing the roles they play in the show.
You can tell they're thinking hard about that because the meat of the episode is explicitly about what makes Starlight Starlight and Trixie Trixie, and both of them different from the Mane 6. The whole final chat between the two of them is about how Starlight isn't who she is if she's bottling up her feelings, which means the writers are thinking carefully about what makes her distinctive as a character. It's not just that one-note gag about bringing up her dark past that kind of wore out its welcome in S6; they referenced that here too so we could tell they're well aware of how pervasive it had become as a thing about her, and that they were consciously trying to draw attention to other aspects of her personality, namely her insecurity and willingness to compromise herself out of fear of losing her friendships. And Trixie... well, she's developing into a pretty great comic foil, and frankly I got a lot more laughs out of her mannerisms than Pinkie Pie's tired cheerleader shenanigans.
I'm pretty stoked for the writing from what I've seen thus far of S7. Seems like it's much more explicitly character-driven and personality-focused than has been the case in the recent past, and I think it's something I've missed since the show has been focusing on wide-ranging adventures and such rather than the self-help and friendship lessons that the show originally had as its mission. Feels like they're trying once again to think of episode themes by starting from a lesson in social graces and building out a story from there, rather than "let's see X location" or "let's see so-and-so do Y" and trying to make a moral happen from within it.
I'm also pretty impressed with the counterpoint trickery they did during the climactic scenes, and even in the middle of the song, having dialogue get echoed back and forth between the two locations and the two groups of ponies. That kind of showoffy flourish is something I haven't seen in the show in a really long time, maybe even since the first few just-finding-its-feet episodes of S1.
Also the song itself was clearly a deliberately corny bit of self-parody, but I loved the trotting animation in the chorus.

Reminded me of this somehow: