Hi,
Last month I migrated of a small Dart-Polymer app to Dart wrapping of mdc web components based on standard elements.
Used a React inspired approach instead of a html snippet/attribute binding design. At least for this app I got surprised, how things was simplyfied.
For web apps I have started on a rough scale to loose faith in the concept of web components(custom elements). Html snippets/attribute binding stuff combined with a imperative approach and the complexity of DOM/html/css just makes things really complicated.
Regards
Jonas B.