This is not metrics for decentralization. Because we can quantify it and it will be different for different amounts.
That means for 10K payment it is not important if node has 1M or 10M channels, so it must be lower bound and connectivity will have nothing to do with large players. More cheap alternative routes will be available.
Yes and no...what will happen to the network if the biggest 200 nodes (on 16.000) will desappear tomorrow? In a strongly decentralised system nothing...in our reality there will be many problems.
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It will be bad. However, that will also mean more opportunities for everybody else. Many payments fail, and somebody may not even notice that 200 nodes went offline.
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