Mass adoption of Bitcoin would be a mass surveillance dream due to the lack of on-chain privacy. It also won't be censorship resistant without privacy.
Still not too late for Bitcoin to add serious on-chain privacy via encryption rather than obfuscation, but it's getting there.
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Questions out of ignorance!
Is the lightning network private!?
Can the lightning network be made private in an easier way than the settlement layer!?
Does this means BTC has no chances of becoming private!?
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Lightning channels and opened and closed on-chain and there isn't any strong on-chain privacy available. Using Lightning without trusting others, etc. means you have your own node with channels open to other nodes. There's a whole lot of metadata available for others to view.
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Payment routing has weak privacy through onion routing but isn't comparable to Tor because you can only route between nodes with channels open providing enough liquidity for your transaction. It's not like Tor where it chooses a random entry point and route through the network.
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Choosing a Lightning route is mostly about it finding a way to successfully send the transaction, which is far from guaranteed to work. It needs to find a way to get there with available liquidity which is a hard problem. It can randomize to an extent when there are choices...