A lot of people still prefer 2-3 regular width screens. I’m in this camp, because I’m an ardent user of virtual desktops in macOS and Linux, and that setup allows each monitor to have its own set of virtual desktops, which then allows for instant, independent switching between primary and secondary sets of windows by just switching virtual desktops.

I’m sure it depends on the workload, though. My use case has me switching between numerous different apps over the course of the day, but I could see how someone who mainly needs a single large set of windows onscreen at all times would prefer an ultrawide.