Development moves faster and with far less bureaucratic hurdles than with Bitcoin. No contentious forks (thus far), they had SegWit first and chances are they will have working, beyond proof-of-concept Lightning first.
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.
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. ;-)