We are leveraging @WebComponents to build front end widgets that work across all our web properties easily even when there is no other commonality in the underlying frontend stack.
Being able to ship small, self contained UI elements has allowed us to strategically eliminate technical debt in small bites while shipping highly interactive, fast to render fully reusable components constantly.
We've built some components with Stencil and Lit but the majority are still vanilla @CustomElements with the styles namespaced by the custom element name to keep them contained.
We are really happy with our ability to make forward progress without requiring any big bang rewrites of our site's underlying frameworks and to share the latest component packages across the company.