If I (like my wife) was going to use a TV as a monitor at her desk, I would definitely want a 4k monitor. Up close, that is a video wall, with no need of window scaling.

Such as it is, I use 3x 1080p displays. It's fine for me, and approximates a larger curved super-wide display (while also being cheap). She does just fine with 1080p resolution however - rarely has more than 2-3 windows on screen at a time.