I kinda like this approach. You can change the combination of used APIs for different cases. "Widget" that you provide for partners to put on their web pages?

I kinda like this approach. You can change the combination of used APIs for different cases. "Widget" that you provide for partners to put on their web pages? Of course you'll use shadow DOM, because you don't know the page context, surrounding styles, etc. A component to share on different parts of your site - you can skip the shadow DOM, because you share common styles everywhere, and probably you want to inherit some of them.