.. plus, assuming you need some client-side state dependent template rendering in an actual Phoenix LiveView app:

• shadow DOM + id a must unless you want to use the phx-update="ignore"
• importing (a copy of) the tailwind sheet and having the render root adopt it when you need the same styling as throughout the rest of the app
• in dev, listening to app.css getting changed by tailwind and rebuilding app.js if you need to add tailwind classes to custom elements that don’t yet exist elsewhere on the fly
• writing your own directives to supplement Lit (e.g. for window events)
• …

Web components are truly awesome because there’s virtually nothing you can’t do client-side in an elegant and future-proof way.