I feel like some context is missing. What's interesting here?

I lack context since I've never used Blender. But it seemed quite tantalizing as a visual way to program a computer. That already exists.

For quick context, render guide has a lovely rundown that should read okay for someone who hasn’t touched blender. https://renderguide.com/blender-composition-tutorial/ on second thought you’d probably need to start here: https://renderguide.com/blender-shader-nodes-tutorial/

@Kartik Agaram fair! The style of node-wire interface on display here is typical of compositing tools — Nuke and Shake had this style of GUI about 20 years ago IIRC. And if I have my history right, the Enso folks (formerly Luna) actually cut their teeth making a VPL for compositing before pivoting toward a more general programming tool. All the tools look and work similarly, because that's the expectation of people trained in the field. Other super-similar VPLs exist (in blender and elsewhere) for defining shaders, animation systems, rendering passes, and more.