The only use I can see is a future one: if ever the Sample Sound node or a similar one will allow realtime usage of an audio input (microphone, another software, an instrument, etc.), JACK will allow to route any input through that. I’m currently doing this in Blender using the external add-on AudVis, and it has a lot of potential for live, real-time music visualization using Geometry Nodes and EEVEE. It already works, even if currently it isn’t implemented natively. So, if anything, I wouldn’t close that door given that this could become a really cool future development.