Lightning Network: Is it creating 3 transactions instead of 2?

Lightning Network: Is it creating 3 transactions instead of 2?

I'm watching this Lightning Network presentation by the original authors. At 9 minutes in, he notes that all the network sees will be a transaction to the multisig address and then a transaction to Alice for 0.8 BTC and a transaction to Bob for 0.2 BTC.

Is all of this effectively 3 transactions? Would it not be cheaper and clog the blockchain less by simpling having Alice send 0.1 BTC to Bob and then another 0.1 BTC to Bob and have 2 transactions instead of 3?

http://bit.ly/2Wt8IcK

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