For what is this the right place and for what not?

Is https://webcomponents.org the right place e.g. for things like https://webcomponents.org/element/lit-apollo? This is not the web component(s), this is a set of base classes which authors are meant to extend to help create custom elements.

Web components are a set of web platform APIs: Custom Elements, HTML Templates, Shadow DOM, HTML Imports (ES Modules / HTML Modules). The component does not have to use all of these specifications. If the web component does not use HTML Templates, Shadow DOM, HTML Imports (ES Modules / HTML Modules) specifications, it is still a web component. But what if the web component does not use Custom Elements specification? Is it still a web component? What if it does not use any of these specification? Is it still a web component? Is https://webcomponents.org the right place for them?