[skydhash]

Sublime Text and Blender (and I guess the majority of CAD applications) creates their own UI engine. That would be better than the current state of electron apps, but most UI engines I encounter have support for custom elements. The issue is more wanting access to lots of cheap developer resources than branding.

[JeffSnazz]

I'm not sure about Sublime Text, but I can't imagine Blender is very accessible. As it's such a visual app that's perhaps not surprising, but this approach wouldn't work for other app styles.