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I like them too. It's a shame that SBW & OBW have stopped working on it. I think if they kept at it for a few more years it would have gotten more adoption, especially now we're in a high fee environment.
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One use case: there's a way to use this mechanism to connect a Lightning network node on Liquid with other channels on the main chain. If I were to guess, i imagine all these tools can be complementary to each other. Perhaps if fees go really crazy in the future, there will be more incentive for developing these things.