I think it has more to do with software engineers being more likely to have spent a significant amount of time with the internet, (some form of) internet cultur

I think it has more to do with software engineers being more likely to have spent a significant amount of time with the internet, (some form of) internet culture, and then sharing on the internet. Outside of software engineers, there are so many people who run businesses whose internet exposure ends at writing emails. These people might be just as willing to talk about what they do, but it's going to happen in-person, not on a blog post.