Check this:
Discussion
I’ve read it, but still don’t understand what problem it solves. Something, something… makes Lightning transactions better.
Imagine you want to be able to send and receive lightning payments, but you don't want the hassle of managing a lightning node (ex: liquidity and channel management). With submarine swaps you can do it.
I made a wallet that works just like that, give it a try at https://helm-wallet.com/
Yeah the whole inbound/outbound liquidity and channel management is a nightmare for anybody who is not a techie.