Just a note for readers in the future @trusktr made a related topic to this that explores this a bit further:
I’m very much in favor of exploring this. Would really love to bring back the days of rapid prototyping and expand it to other feature rich packages like socialize (@copleykj). Then they could be made easily themable and as things advance the components would be more optimized for larger deployments.
But something in my memory is telling me that there was some issue with Web Components in Meteor. Not sure what, but I wonder if that was resolved already.