It baffles me that anyone would even attempt this, considering that a very similar technology -- not touchscreen keyboard, but with roughly similar properties -- has been tried in the 1980s, repeatedly, and has been, well, pretty much a failure for general-purpose computing.
(Edit: for confused readers, what we used to call a "membrane keyboard" looked like this: https://upload.wikimedia.org/wikipedia/commons/2/2d/Magnavox... . I.e. literally a membrane, with key outlines printed and nothing else. You'd press on the outlines which would go down, traveling no more than a few mm, a distance that was barely perceivable).
The ZX81 (Timex Sinclair 1000 in the US), the Magnavox Odissey, all had membrane keyboards and they were absolutely miserable. They weren't laggy or anything, it's just that the nearly complete absence of tactile feedback made them extremely annoying to use for any kind of productive purpose. They were beyond terrible and I can't imagine why anyone would want to go back to almost that. I say "almost" because membrane keyboards actually had a modicum of tactile feedback, and some manufacturers did eventually give in and produce membrane keyboards with some sort of tactile hints (e.g. embossed letter outlines). Touchscreens are even worse than that.
Membrane keyboards were ok (and still are) for things like limited consumer electronics controls and 16-key industrial touchpads (they're basically immune to liquids and dust). But they turned out to be useless for typing more than 20-30 characters at a time and they were abandoned save for a few niches.
(Edit: for confused readers, what we used to call a "membrane keyboard" looked like this: https://upload.wikimedia.org/wikipedia/commons/2/2d/Magnavox... . I.e. literally a membrane, with key outlines printed and nothing else. You'd press on the outlines which would go down, traveling no more than a few mm, a distance that was barely perceivable).
The ZX81 (Timex Sinclair 1000 in the US), the Magnavox Odissey, all had membrane keyboards and they were absolutely miserable. They weren't laggy or anything, it's just that the nearly complete absence of tactile feedback made them extremely annoying to use for any kind of productive purpose. They were beyond terrible and I can't imagine why anyone would want to go back to almost that. I say "almost" because membrane keyboards actually had a modicum of tactile feedback, and some manufacturers did eventually give in and produce membrane keyboards with some sort of tactile hints (e.g. embossed letter outlines). Touchscreens are even worse than that.
Membrane keyboards were ok (and still are) for things like limited consumer electronics controls and 16-key industrial touchpads (they're basically immune to liquids and dust). But they turned out to be useless for typing more than 20-30 characters at a time and they were abandoned save for a few niches.