T7 is quite a bit larger than lit-html, and requires a vdom reconciler still. lit-html is self-contained and < 2k minified and gzipped.

I also didn't want to use vdom because it doesn't encode whether nodes are static or dynamic, and even static sections are diffed. That's extremely important feature for performance and memory overhead, which is why I'm happy to see that emphasized in Moon.

Also, coming from the Polymer team, where we've had a lot of success using <template> elements to stamp out large pre-defined DOM trees, I wanted a system backed by those.

thanks for the details.