I've rewrote the frontend of one of my personal apps from react to webcomponents lately. For me, the most interesting aspect was that it's part of standards, requiring no dependency, so it means that I can use this app for decades without having to maintain it.

For the same reason, only the first example in this page would do for me (the one based on standard without using any library). But I suppose that for actually publishing something, such library would be needed, if anything for polyfills for older browsers (but then again, we don't expect published work to stand for decades without changes, so maybe the call for standardized technology is not as strong there).