I'm not looking for STT->AI ->TTS, I'm looking for truly good voice-to-text experience* on Linux (and others). Siri/iOS-Dictation is truly good when it comes to understanding the speech. Something this level on Linux (and others) would be great, yeah always listening, maybe sending the data somewhere, but give me UX - hidden latency, optimizing for first chars recognized - a good (virtual) input device.
RCLI is Apple Silicon only today because MetalRT is built on Metal. For Linux, the closest thing to what you're describing would be building a virtual input device on top of Whisper or Parakeet (which RCLI supports as STT backends). Parakeet TDT 0.6B has ~1.9% WER, that's very close to production dictation quality.
The missing piece on Linux isn't the model, it's the integration: a daemon that captures mic audio, runs STT with hidden latency (streaming partial results), and injects text as keyboard input. sherpa-onnx (https://github.com/k2-fsa/sherpa-onnx) supports Linux and has streaming STT, it might be the best starting point for what your after.
We're focused on Apple Silicon for now but broader platform support is on the roadmap.