Well, in my work, I often need to cross-reference a couple of PDFs, an Excel spreadsheet, and a bunch of supporting documentation with data to run engineering and financial analysis and to create a comprehensive report that could cause (or cancel) many millions of dollars in spending. At work, I use two 24" monitors because that's what they ordered a while ago and refuse to upgrade. When WFH, I use a combination of 32" and a vertical 24" monitor and it's unbelievably more productive.People who actually work instead of multitask?
If you can do your work by concentrating on a single app window, all power to you. But different jobs require different tools.