Since I touchtype, I did that once after cleaning my keyboard. Put all the keys back on in a random order.
Two things I learned amazed me:
1) How often other people used my keyboard, and
2) Just how few people who make their living typing into a computer can touch type.
As for cleaning, making keys that pop up for cleaning probably wouldn't be an issue, but the connector on the keyboard would likely be much more fragile than on current keyboards. Currently you just need a knob that presses down. That's pretty difficult to break, with this the connector woul have to have the ability to pass digital information and would be much more susceptible to soiling when exposed by removing the key above it.
$200 (at least) is a very expensive keyboard on which to spill Coke.
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