Any benefits to contra-rotating multi-rotors?

I would think stability, but the downside of more parts that might break.

I had this idea of a multi-rotor with 16 motors, it's actually four identical quad-copters that stack together, 8 motors face up, the other eight face down, but they can fly independent of each other.

Anyway, I was thinking while it can split into four multi-rotors, it would also be sweet to lift something big.

Having four in one serves a particular purpose in my case.

I was just wondering if there are any obvious "no-nos" I'm overlooking.

I was thinking it would be like a master-slave deal when all four are "snapped-together"

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