Any workflow profits from a 3:2 ratio. How often do you need to scroll vertically vs horizontally? Webpages scroll vertically. Word pages are in portrait orientation. Excel sheets scroll mostly vertically.
I don't doubt that
you get more out of a 3:2 screen with your workflow, but
any workflow is a very broad statement, and if it were so universally true 3:2 monitors would be more popular and my workplace would have a lot less ultra wide monitors and a lot more vertical screens.
I personally spend more time looking at landscape-format plans and wide flowcharts than I do Word documents, and I scroll those horizontally as much as vertically; so much that I often keep a trackpad next to the keyboard entirely for use scrolling and pinch-to-zooming (my diagramming app is in fact so non-vertical that I have it set to use right-click-and-drag to pan and the scroll wheel to
zoom).
Even Excel, I'm far more frequently looking at tables with a very large number of columns and am more interested in viewing as much of a row as possible than many rows of data, so I'm
far more likely to have an extremely wide Excel window on my ultra wide primary monitor than to have a really tall one on my portrait secondary monitor.
And while yes, lot of people do spend most of their time in "vertical" documents, the reality for my use case (and I believe the majority of my co-workers) is that I need to have 2-3 documents on the screen at once VASTLY more often than I need to see more than one screen-height worth of content at once. This is why I use an ultra wide and many others at my workplace use side-by-side landscape-oriented 16:9 screens.
Word docs and web pages, absolutely vertical... but if that is your primary need, then you're in theory even better served by a portrait-orientation monitor, which I have to the side of my ultra wide right now, yet not many people do that--only one other person in the office despite two thirds having at least two screens.
I've noticed that in practice, I rarely bother putting documents on my portrait monitor--the extra height/less scrolling just doesn't feel necessary for most tasks, even web-page reading or document writing and editing. Same reason, I suppose, that I rarely use my iPad in portrait orientation, either.