Good point on the dependencies, I was definitely shocked when I npm installed lit-element and saw one folder in node_modules. There is definitely a lot of developer convenience in those types of up-and-running tools, but there is a cost passed on to the user. I have heard of Pika before and I like their vision. It brings me back to the old days before all of the "necessary" tooling.
I think it makes sense from a viewpoint of web components being reusable things and not part of a larger library or ecosystem. I think for me it is deciding really how I want to use them since they are basic building blocks. I could write LitElement components and create a basic router (or pull in an existing library) but there may not be a roadmap to follow and some hurdles to jump over. Or I could use a library I like such as Vue and pull in web components, I'm sure there is some documentation out there but there also may be some things to figure out. Those components are then freed from any one library and can be used in my next Vue app, React app, or [next big library] app, which seems like a good deal.
I think this is sort of the vision, although I don't want to speak for those frameworks (I suspect they're generally on the no-WC-bandwagon). But again, it doesn't matter, because now you've just created a better HTML element that slots in nicely—it's no difference from a complex built-in.
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