Interesting, it sounds like they should try to invent something that works in similar way to nerves on the skin as you can feel slightest touch regardless of moisture.
I remember one elevator button was a large metal bulge, that didn't get pushed, but instead did a little electric jolt to my finger (at a very small distance between finger and the button).
Here you can see it on 0:23 of video tour: https://marketplace.vts.com/building/400-capitol-mall-sacram...