There's a *lot* of prior art in chord keyboards (as they're normally called), and they work really well in a lot of environments. I suspect I might like five nicely-spaced buttons so I could do one-handed typing on the phone.
You can imagine a chord keyboard that fits in your pocket so you can type relatively inconspicuously (though you may get some odd looks).
I think Steve Mann's group ("wearable computers") at Toronto have done some work in this area.
You can not imagine doing this with a conventional keyboard. Unless you're a cartoonist, in which case you can imagine several appropriate responses.
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