Its simply a disagreement of ownership. If I send you 100,000 sats in a channel, and you send back 50,000. Then I take my node offline for 2 weeks and you broadcast a force-close transaction With the previous chain state off 100,000 on your side of the channel. Do I still own the 50,000 you sent? No, I lose that because my node did not broadcast your revocation secret. This is my point. Lightning IS back with bitcoin but it is not considered "Owned" the way bitcoin is because my private keys can always show ownership over onchain BTC but my lightning keys MUST be actively online or I MUST use a watchtower node or "my" sats can be stolen. I emplore you to read more about the Lightning network and its trade offs.