When I read your comment I thought "hang on, I remember this discussion from years ago". Looks like the issue dates back to 2017 indeed. I remember this idea be

When I read your comment I thought "hang on, I remember this discussion from years ago". Looks like the issue dates back to 2017 indeed. I remember this idea being shelved because of concerns around the handling of things like scripts and stylesheets, especially in the context of the idea of HTML imports (which were the next big thing when Google's Web Components advocates harassed other JS frameworks for not being Polymer - until it turned out that HTML imports had to be shelved and Polymer ended up being shelved in favor of the next big thing Google pushed out).