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.