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They always wanted to do "more traditional" idol activities and they already lived in Japan for YEARS. Be happy for them, and it's not like they won't give you anything back. Change might be scary and unpleasant, but you will get a shitton of 3D, covers, karaoke, and unexpected collabs. Plus the usual Bau Baus, game playing and zatsudan chill. Also watch them become very reliable senpai for the next generations.