Can you post info about them contributing to speech synthesis? I use NVDA as my screen reader with the built-in espeak synthesizer. I've been using synthetic speech so long I find I don't want natural sounding voices, I prefer more robotic sounding ones since I can listen to them at a faster rate. Vision tasks is a good point but not something that applies to me. I almost never use a webcam on my personal computer. I use my iPone for OCR although I could see a webcam being useful for OCR in some cases.