The Dvorak keyboard layout. I had a coworker a few years ago who was a Dvorak evangelist, talking about how much time he saved from typing efficiency alone. Seemed like a textbook case of effort justification to me. There is no efficiency gain big enough for me to want to reroute the muscle memory in my hands.
Blockchain. Not only is it buzzwordy and overhyped, but the energy consumption necessary to mine cryptocurrencies based on the blockchain is an environmental hazard and a huge ethical concern.
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