We have several web applications that we wish to present under one single page application. We are looking for a micro-frontend architecture/framework to use. As we see it,
We have currently worked on exact same thing with single-spa framework. And we have come to same conclusions as you have. One major issue for us was translations for a child app, since at least we could not figure out a way to bundle them to the child app. Other assets like styles are an issue as well.
My suggestion would be to wait for angular elements since the framework is not designed to be used in micro frontend style.