Why two anchor outputs are used in the LN?

Why do we need two anchor outputs on a LN transaction? Wouldn't be more effective to just have one spendable by anyone?

Pinning would not be possible due to full RBF enabled by default (you can replace the Tx spending the anchor). Also because of that CPFP carve out is no longer needed for Lightning right?

Is there any other reason right now for it?



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