Builder is mostly targeted at building XML files, and so compared to XML its fairly terse. HTML is just a nice also-have. There are template langs in ruby that are a lot closer to the Elixir temple variant, but I can't remember any of them off the top of my head haha.

A good template would make interfacing "easy". JSX[^1] is a very good example of how you can interface quite easily, and the templates used in Surface work really well to bridge some of the complexities of a server-rendered but client-dependent syntax.

[^1]: I know JSX isn't a template language, the differences don't matter for the purpose of this discussion