The 16:9 craze drives me mad: it's jack of all trades master of none, compromise every other way. Maybe nice to watch TV shows, not really good to watch movies, not tall enough for a single screen, not wide enough to 50:50 split left/right (each side is too narrow). Putting two side by side makes you face the bezels, and constant-tilt your head either left or right when you focus. Three side by side is way too wide. Probably why some folks put three but have the two outmost ones be vertical. Which brings me to 9:16 which is way too thin AND tall.
A triple head 4:3 setup was terrible for movies, but reaaaally nice for a battlestation. Maybe 5:4 would have been quite something but I never experienced that.
I do like the Ultrawide things though, 2.4:1 feels like two 4:3, only continuous, no bezel in the middle. 3.5:1 is technically about two 16:9 but feels like triple head 4:3. They're especially comfortable when curved, but damn, none are HiDPI, which kind of ruins it. And of course that's kind of a no-go for laptops (or maybe not, but I bet the manufacturer attempting that would somehow botch the execution)