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Good question, but I don't think this is the place for that conversation :) And I say that as a Dlang fan :)

Why would a comment suggesting to use D not be the place to have a conversation for why D doesn't see adoption?

You and Walter could do that, but this post is about some cool devs and their cool Zig project.

The title is "Why we built Lightpanda in Zig", i.e. language selection criteria. Comparing it with D is on topic.

Absolutely. Rust is the only language that's allowed to derail HN programming threads.