LN has no network wide audit/consensus that checks that all nodes/channels are all connected to the bitcoin network.
some LN users right now only have channels/nodes pegged to litecoin
True. But as far as I know, those LTC-LN-nodes won't interact with a BTC-LN-node, so even though they all use some form of LN, they won't mix up transactions.
Wasn't there a big selling point of LN during the whole block debate shitshow that among other things it will enable atomic swaps? TBH I'd be far more excited about that than merely pushing sats around