Only as useless as you want it to be, you could, for instance, use it with the hardware sync plugin to display CPU or GPU usage. I should mark it as manually configurable for segments so you can divide it up and use it for both CPU and GPU actually.

The OpenRGB Effects Plugin has some audio visualizer effects including a port of my old Keyboard Visualizer. You can also use the Python SDK to integrate OpenRGB lighting into third party software.

Yup, OpenRGB has audio visualization support in the Effects plugin: https://openrgb.org/plugin_effects.html

While I'm generally pretty anti-AI especially in OpenRGB itself, I did try slop coding a Decky plugin with free AIs for selecting OpenRGB profiles and colors just as an experiment. It didn't go well though and I'm not familiar enough wih Decky or the languages it uses to really do it justice. I'd love to see such a thing from someone who knows what they're doing.

The built-in controls are already pretty good.

In game mode yes, at least during downloads when it uses the LEDs as an indicator. It does not stream effects in software otherwise, it just lets you choose from the built in effects, so OpenRGB can take over without Steam trying to fight it most of the time.

From a very surface level look at the code it looks like the module disconnects the data coming from steam while OpenRGB is active. But i dont really do C so i might be totally off here.