Tongue movement detection cannot track only six phonemes: - b - p - m - f - v - h

That’s a remarkably small number compared with other methods. English could easily be optimized to achieve a sub-5% WER with a very small model.

I suppose Spanish or German would be easier to recognize than English, due to the more distinct sounds, but Chinese would be much harder, due to the tones.

reminds me of the handwriting recognition language Graffiti from palm/handspring days.

It ended up altering my handwriting even after I stopped using it.