What's wrong with just going back to plain-old keyboards that work? Why do we need this 'innovation' in the keyboard space?

'My keyboard broke' has never been a problem. I used the same laptop for just shy of 12 years. No keyboard problems. I'm typing on a 10+ year old keyboard right now. The only 'problem' is that some of the letters are partially worn away. Why not just use what works instead of inventing something new, probably more expensive, with new and different failure modes?