bitcoin is the settlement layer. when you eventually want to exit LN with real money, you settle to the bitcoin blockchain. it's also used to arbitrate disputes between LN channel participants---if one participant is dishonest, the other can publish the true channel state to the blockchain.
This was my initial point, then I was told some hogwash about the LN being used indefinitely - like you never really need to settle. As you just said, if you want to close the trxs for real money you need to settle onchain. So, retailers need to settle each trx after it happens, and typical one time peer to peer trxs need to settle after each trx - why? BECAUSE REAL MONEY NEEDS TO BE TRANSFERRED.
I hate when someone is so stupid they don't even understand my point, then try to spin it to some total bs. That idiot who didn't even understand my point actually had the nerve to call me thick! lmfao. Thanks for confirming my original comment that the LN is useless for most bitcoin transactions between peers and retailers/customers. Totally. Useless.
For those situations where ongoing trxs occur between parties, using the LN offchain is losing the decentralized unchangeable ledger that bitcoin provides, which is the whole fucking point behind it. The LN is not a solution to the scalability problem.