I love writing Web Components, but they're never going to really be a thing. The promise was that we could create native components without any dependencies at all but it just hasn't worked out that way. Shadow DOM support, the real killer feature, is patchy at best without polyfills. Orchestrating them into any kind of complex app still requires some kind of framework to handle things like passing down props and event binding, which at that point you might as well go full on (React/Angular/Vue) + Webpack/Babel. The dream of being able to share reusable components breaks down the moment your designer wants an extra 5 pixels of padding here or there. It's fun to use them for small things but it's just not viable as an alternative to frameworks.