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Your oshi can dance? Good! You get a great performance, and I'm happy for you!
Your oshi has learned how to dance? Great! She's put in the effort to give you a good performance! She's very dedicated, and I'm happy for you!
Your oshi doesn't know how to dance? Cool! Even though she's bad, she's still going up on stage and doing her best for you even though it can be very embarassing! That's commendable! I'm happy your oshi still tries for you!
I don't see any problem here, only your oshi getting up on stage, having a good time, and making (you) have a good time!