Liquid is a great tool that bitcoiners should try out - have it in your 'toolbox'.

A key differentiator for Liquid v Lightning, is that Liquid does not require online infrastructure whereas Lightning does. I use both, and as others have pointed out, boltz.exchange is great for atomic swaps between Liquid and Lightning. I don't think Lightning obsoletes Liquid, although the publicly discussed use case for Liquid (fast private liquidity between exchanges) appears now better handled by Lightning.

As Bitcoin grows, the use cases evolve and change, and so do the tools that deliver against them. boltz.exchange is a good example. So, my advice is run it, use it, understand it, and then you've got the skills to use it if/when you need it .. or the understanding to say: not for me.