Yeah, I actually like what they're doing. Like I love my fluff but I actually enjoy the mangaka's kind of use of tone. Shiho's part feels like a drag because she IS a drag. She is a drag and sucks the soul out of you due to her own issues and that can be tough and Himari is a literal puppy who wants to make everyone happy so of course she's going to try and fix the emotional leech that is Shiho.
And just seeing how different sunny spot is. How happy and energetic they are, you can kind of get the feeling about Shiho. She drags people down. She kills the mood. Where the other girls don't. And it's about Shiho realizing that at the end of the day, all her problems are self-inflicted.