What I’m calling “professional” tools (so not Publisher) aren’t only used by desktop publishing businesses. Only time I’ve ever been professionally involved in desktop publishing, was when I worked for a university - they used QuarkXpress for official university publications, such as the annual course catalog. I wrote a web-based database to store the course catalog (somewhat unusual tech stack of Apache+PHP on Solaris SPARC talking to MSSQL on Windows - we had our reasons) - staff would use its admin interface to CRUD course descriptions, which would then be published to the university website in HTML, and exported to QuarkXpress for printed publication. Originally I tried exporting it as XML but found QuarkXpress XML import feature too buggy, had much more success generating Quark’s proprietary XTG (aka XPress Tags) format (which looks a bit like HTML/XML/SGML but isn’t any of them)