You would probably not find it so silly if instead of dancing we were talking about medicine, information technology, languages or aeronautical design...
I teach languages. You will reach a threshold in your learning when you can switch to self-learning. At that point, I would always recommend learning through real world experience over private lessons. I am ecstatic if advanced students continue taking lessons from me, but I will never tell an advanced student that it is essential for them to take lessons if they are already able to communicate close to a native level.
Also, formal education in language learning doesn't interest me. The school system has already failed me big time. Screw the establishment.
I say go out there and get real world experience.
Advanced dancers can go back to beginner classes if they want, but it isn't necessary.
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