Here are a few ideas from my side:
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Revisted talk "X More Ineffective Coding Habits of Many Programmers". In one of your interviews, you mentioned that you do a lot of code reviews. I'm sure you've noticed recurring code smells. I am also sure our audience is not immune from them. If you could compile a list of "the worst habits" and provide solutions, the attendees would be happy.
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You pay a lot of attention to words and language. I've watched all your talks, and whenever you show the code, it "speaks for itself," and has a high signal-vs-noise ratio. A talk that shows developers how to write code that speaks human/domain language and gives a good reason for doing so can make developers rethink how they see and write code.
Ideas/suggestions are welcome.
Great, let's go for the Lean Code then.
P.S. no surprise so many people liked the talk. It ticks all checkboxes of an exemplary talk: ✔️ relevant ✔️ practical, ✔️ inspiring, ✔️ though-provoking, ✔️ maximum signal-vs-noise ratio, ✔️ high energy... Magnum opus.