Bakers certainly write books and magazines[0] on baking, as well as interminable stories about their childhood. Mechanics: [1]. I could only find one obvious one for dentists: [2]. Somebody else did accountants in the thread. I think it's a human thing, to want to share our opinions, whether or not they are well supported by evidence. I suspect software people write blogs because the tech is easier for them given their day job.

[0] https://www.google.com/search?q=blaking+magazine [1] https://www.google.com/search?q=mechanics+magazines [2] https://dentistry.co.uk/dentistry-magazine-january-2023-digi...