New reader experience of Volume 3

I've just wanted to ask a question/talk about what I think so far of volume 3. From what I heard a good chunk of people says that the story somehow gets worst after chapter 350 but after reading ahead to chapter 400 I genuinely don't understand why they would say that.

I can definitely see that there was a big tone shift from the forgotten shore to what i'm reading now but regardless I still enjoy it and I don't feel as though the quality has diminished. This calm period that feels more slice of life-ish feels earned and like a breath of fresh air. I enjoy seeing sunny get used to his new life and interacting with regular people that aren't part of the main cast. I also don't mind the main cast taking some time off from the story, as much as I love all of them I definitely think there can be too much of a good think and giving them room to just continue their own life's is good.

But the main point being, I like what I'm reading, I like sunny having a deserved more relaxed life for now. So I am curious what other people think and why there was this negativity around this part of the story?