Live programming. Devs are stuck in a code-run-debug-code cycle, but it doesn't have to be this way. What if you could see the values of your variables while you program? Once you try it you realize just how slow normal programming is.
There's some very exciting work going on in this area - look at lighttable / quokka / wolf / algojammer / FoxDot.
I'm the creator of AREPL, a vscode extension for live programming in python. I'm convinced that live programming will be a big thing. It may not be my extension, or any of the things I listed, but eventually live programming will become popular, not just a niche theoretical concept.
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