@danielbmarsh thought I should mention that there has been some movement on this with the Oct 5 release:
I’ve done some testing and ported a few templates from pdfmonkey over. Things seem to be working quite well since you are also still able to make use of javascript code blocks which opens up all sorts of interesting things including running graphql queries to fill-in related information.
There are still a few areas for improvement, but this is still quite a great leap forward.