More specifically, expositional prose (as opposed to - say - API reference doco).
I think this is important in software development - analyzing complex situations and communicating our understanding. It is a skill that many of us have little natural aptitude for, but that we don’t commonly get much guidance on. Even in companies with document-heavy processes, the typical starting point will be a template document with blank sections that somehow have to be filled. Moreover, there are plenty of forms of communication (problem analyses entered in to bug-tracking systems, pages in internal wikis, email) which benefit from being well composed, but that are essentially free-form.
As to who I’d like to see authoring such a book, I’m not really sure. I was going to suggest Richard P. Gabriel - but I don’t think that would be quite right. Gabriel’s “Writing Broadside” was to do with writing conference papers, and a conference paper is some that will have a long gestation period, going through a number of revisions. But what we often need to do it to be able to write things well, quickly. Perhaps journalism is a better model than essaying.