That sounds pretty close to what Scenic does for OpenGL-rendered UI. Scenic has some interesting properties in that if a specific component has a code problem

That sounds pretty close to what Scenic does for OpenGL-rendered UI. Scenic has some interesting properties in that if a specific component has a code problem and fails/crashes, the supervision tree will bring it back to life. I'm curious to see what similar things one could do with Lumen for the web. Components are already a very popular level of abstraction with Vue and React, probably others. So maybe there are useful things to bring from Scenic.