I get it. I did my last project with a Web UI because that's the only reasonable cross-platform UI rendering engine I could find. And on Linux, a far superior choice to GTK, which doesn't seems credible because it requires a complete reimplementation of your UI code on every major release, and QT which is held hostage by commercial interests, and licensing terms that are inscrutable.

For a UI engine for native applications, it seems like a sensible strategy: use a layout language that developers are likely to already be familiar with.

Hopefully, in the longer term, there will also be a Blitz-TML library with higher-level UI components as well.

Good luck with this. It looks interesting.