We had an optics lab at the Faculty of Engineering, Lund University about the idea behind the FlatFrog display system back in 2014 (I think) and I remember thinking it was genius.
It bothers me immensely that they redirect docs for services that work perfectly fine by themselves to amplify docs with a note that says something like "use amplify".
Other than that, using AWS services directly is always a much better experience. In my opinion amplify is like a dumbed down version of that.