@allObjects - yes. And size. It's hard to get affordable yet big OLED displays. Even the small 128x64 OLEDs use around 20mA when on - so that's 10 hours on a CR2032. The LCD uses 0.15mA, so it's plenty for a week of usage.
@Ollie there was definitely quite a lot of tinkering by some people. If you looked from the back of the conference hall you could usually see the Web IDE open on a few people's computers :)
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