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They existed for a while; but were odd and expensive and by the time cheap commodity PCs could push enough pixels to make one worth using they were also often pulling double duty as DVD players, with 4:3 and 16:9 ratio content.

Mid-range and higher monitors often have stands that allow for 90 degree rotation of the screen, so the wide screens could shift to vertical; sadly a good way to openly communicate that back to the GPU and OS hasn't been a priority.

The timeline here seems quite contracted. Windows PCs started to really sell after launch of 3.0 and the PCs with that did not even have CD-ROM drives by default, let alone DVD. I would say DVD drives started to be a norm at least a decade after the rise of commodity PCs, if you count from Windows 3.0 launch in 1990. And in the PCs that first shipped with DVD drives, the CPUs were not powerful enough to decode DVD video in real time so accelerator cards (and their crummy software) were needed, keeping the appeal limited.

Like the Blit and a lot of Wirth's ETH Zurich machines?

I think there was some Swedish Unix 68k system that had a pivot CRT rather early on, too.

I can't say enough good things about the new LG DualUp. It's what I have on my desk.