I have pretty much the polar opposite take of you. To me, Inuyasha (and this show) are at its best in its more quiet, 'comfy' (for lack of a better term) moments. So I've GREATLY enjoyed everything in the show so far. I actually dread when the long term plot finally kicks into gear and the show becomes a typical shounen battle gauntlet. I would honestly rather watch a slice of life Inuyasha/Yashahime show about just kinda living back and forth between the Sengoku Era and modern times. Can you imagine?
Towa: "Setsuna! Hurry up or we'll be late for class!"
Setsuna: "But Kaede said she needs help flooding the rice fields."
Moroha: "Setsuna, you'd better not keep me from getting yakisoba-pan before it runs out again!!!
"
But, uh, Yashahime hasn't been any of those things. It's a Monster-of-the-Week slugfest (often against enemies they have little to no connection to, or
are the assumed Main Baddie's lieutenants.) There hasn't been any contemplation beyond the Reiwa Period eps, just tiny snippets of Towa sharing some modern convenience with the locals. She is so laser focused on getting senpai to notice her that there has been no time at all to explore how she feels about the Sengoku Period, or how different her life has been, or how different it is
now. So far, the formula has been, "Learn about MotW, see how the locals are affected by it, slay MotW, and either have Towa gain a minor powerup or have Setsuna thaw a tiny bit. Maybe Moroha does something." Even Setsuna's violin skills have come up, what, twice? since it was first introduced? And both times it was more in a sense of, "Wow, she can play really well and people enjoy it" rather than as a way to express her feelings or anything deeper than "she's stoic and aloof because of a McGuffin".
Presumably, Towa's driving goal is to restore Setsuna's dreams (which I still think it's a heavily contrived scenario, when simply reconnecting with an estranged, possibly resentful sibling would have been plenty sufficient for a character's motivation in the hands of a more skilled writer). And,
presumably, the reason she's tagging along with Setsuna's day job as a demon slayer is to gather enough intel on the Dream McGuffin. But the development of the episodes so far has pushed that goal so far into the background as to be immaterial to the ep-to-ep shenenigans. When the writers actively avoid the main conflict that the majority of the audience* is invested in (what happened to the original cast), and the protagonists explicitly reject the conflict laid out for them (the rivalry between Angry Fluff and Angry Giraffe), and only one of said protagonists
has a motivation, but she barely does anything to pursue it, it feels more like the writers and director would rather spin their wheels to keep old fans latched on, instead of investing on a compelling narrative**. And with the addition of new, Original Character antagonists like Riku, and the return of the Shikon Shards In Fun Size Mode, that's at least four major plotlines that the show has spent 15 eps only
teasing at but almost no time actually developing. (And oh boy, if they cram all those plotlines into the final five eps of this season, it'll be a mess.)
I mean, I dropped the original manga because it was stretching out a relatively straightforward plot in the shonen-iest way possible, but at least there WAS a goal everyone was committed to and was constantly driving towards, even if it also involved MotWs and Mega Man powerups.
* Anecdotal evidence, since I don't follow many English-speaking fans, but LatAm fans are
livid with the show. Even the ones still giving it a chance denounce the treatment of Moroha as two-bit comedic relief.
** FTR, by "compelling narrative" I don't mean shonen slugfests. Turn Yashahime into Yokohama Shopping Log if you want, or into an episodic comedy like Ranma, just have the protagonists actually
have an arc and engage with it. Honestly, I would LOVE your proposed version, where they switched back and forth and developed the characters through daily-life conflicts like those. I felt that Takahashi missed lots of opportunities there by not giving Kagome any personal, modern-world issues to deal with beyond the occasional exam, and your version sounds like it would do wonders to fix that.