The Mobile web team finally dedicated some time to investigating Gabriel's Knockoff-Tassembly templating system. Specifically, I was tasked with answering the questions at https://trello.com/c/lYfyzs8A/6-spike-explore-knockoff-templating.
The results of my investigation are at: https://www.mediawiki.org/wiki/Requests_for_comment/HTML_templating_library/...
If anyone has comments, feel free to reply with them.
Ryan Kaldari