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Japanese music scene places heavy emphasis on group cohesion and identity. Kitani's departure impacts not only Yorushika's music dynamics, but also its branding and fanbase. Fans in Japan have developed emotional connections to band members, so they are likely deeply perturbed by this news. Furthermore, his departure may affect the sales of albums and concert tickets given his influence and popularity.
Compared to the US or EU where individual artistry even within bands is often celebrated, Japan usually puts greater emphasis on the overall unity and harmony of the group. That makes departureslike Kitani's more impactful. While band member exits also happen in the West and can similarly influence a band's direction and fanbase, they might not affect the overall band image as profoundly.