TBH, the form factor of a single rectangular screen is pretty old-fashioned anyway. I have a 16"/4k thing attached to the bottom of mine with magnetic hinges for a vital second screen. I'd use the lovely screen of my 14" MBP, but someone stuck a massive keyboard to it that you can't even fold out of the way, so that's destined to be hidden under my desk, sadly.I hope they release 2 sizes, i'm done with 27 inch. its too small for my needs and dont need two such displays.
What I'd REALLY like is, say, a 27" in the middle, with thin, angled monitors down each side (like 16" at 90º), and a fourth underneath, same width as the 27, but way shorter, angled upwards. Like the barn doors of a studio light but without the top.