Speaking of monitors, I got one of those absurd 49" ultra widescreen displays a few months ago. The resolution is 5120x1440, so it's functionally equivalent to two 27" 1440p monitors placed side by side.
The text is naturally not as crisp as a 4K monitor, but the amount of screen real estate is great for development. Paired with a tiling window manager it gives so many options. I did the dual 27" 1440p thing for years, and I find this setup superior. With the dual monitor strategy you have to either deal with a huge bezel right in the center of your vision, or push the secondary monitor off to the side, requiring more neck movement to see what's on it. With this monitor, everything remains much more clearly in my field of view.
Biggest gripe for me with the curved displays is that 1440px in height is not really that much. Kinda blurry when one's used to a 4k display with 2160px over the same vertical distance.
Yeah, if you're used to 4K, the resolution will definitely feel like a step down. For my personal usage, I've found the horizontal space to be really beneficial for development. YMMV.
I would be less scared of one of those monitors, if I could use them as two virtual monitors - that is, the OS would split it down the middle and treat them with separate wallpapers (if desired), along with the keypresses and mouse shortcuts associated with tiling/managing dual monitors.
I believe all of them have a "picture by picture" mode where left half shows one input and right half shows another input. You could achieve what you want with 2 cables.
But I haven't felt the need for such use. I use Microsoft Powertoys to tile a 16:9 area in the center and two half width areas on the sides and I am very happy with that setup. I am sure linux window tilers have even better capability.
The text is naturally not as crisp as a 4K monitor, but the amount of screen real estate is great for development. Paired with a tiling window manager it gives so many options. I did the dual 27" 1440p thing for years, and I find this setup superior. With the dual monitor strategy you have to either deal with a huge bezel right in the center of your vision, or push the secondary monitor off to the side, requiring more neck movement to see what's on it. With this monitor, everything remains much more clearly in my field of view.