I'm not familiar enough with LTC to say if this will continue for the future, but thats the standard argument in favor.
(Anyone with a passing familiarity w/ CCs would know this, but still, it feels like statements that are so blatantly counterfactual should probably be noted.)
The on-chain atomic swap (no Lightning Network involved yet) was executed using Decred technology ( https://github.com/decred/atomicswap ) and was preceded by a DCR-LTC swap ( https://blog.decred.org/2017/09/20/On-Chain-Atomic-Swaps/ ).
(De)credit where credit is due. ;-)
In particular, as coauthor of the lightning spec, I assure you that we're all working on bitcoin. Litecoin happened because it was trivial; interestingly, we've deferred Bitcoin mainnet because it's likely to attract real users, who'll risk real money.