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Network size nothing to do with how many transactions get handled. That is all programmed into the network rules. Whether its 1 computer or 1 billion computers in the network, all transactions must fit into 1 block of data roughly every 10 minutes. So on average that has been improving over the years because transaction sizes keep getting more efficient in the amount of data (bytes) it takes up in the block.
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In short, it's not scalable, and so called "Layer 2" solutions are not part of the Bitcoin network, so don't even start talking about that failed (LN) narrative.
Could it be scalable? Could it be private? Could it be more decentralized? Yes, it's just code.
But Bitcoin
owners have other plans.
I am not sure how you managed to summarize what I said into 'its not scalable'

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The transaction capacity of Bitcoin has been increasing ever since I started using it. And I equally distrust LN, but thats just me, the fact that people use it to settle Bitcoin already means it solves certain issues for certain people. So whether you or me like it, it is part of the narrative.
Like you said.
Could it be more scalable = yes (and done)
Could it be more private = yes (and done)