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Another example: "Hi, I'm X, I work on rustc codegen every day. Here's how I conceptualize the problem space, here's what I rely on LLVM for, here's where we're trying to go".
Unfortunately being a good programmer is not the same thing as being a good public speaker -- unless the speaker is already known to have given good technical talks it's risky to accept. And since most CFPs are blind you can't make that assessment.
I am not trying to argue that technical talks are bad, just that they are more frequently done poorly than other talks and are risky to accept for that reason.
I also think that it's rare for a technical talk to actually benefit from being a talk instead of a blog post. Of my own talks, the one I gave at Rustconf 2017 is one of the only ones that was actually better because it was a talk. Most of mine could have been blog posts
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