People discussing writing Web Components by hand are missing the point.

Web Components, once adequately specced, will become a compile target for higher level frameworks like React and Vue. That way you still get the benefits of higher level frameworks but the components can interoperate with each other. Vue CLI already supports compiling down to a WebComponent, though not sure how first class it is.

There are far too many lacking ergonomics to expect writing Web Components by hand to become popularized/convention