i'm sorry was he benchmarking this at 5120x1440? like seriously do people really game at that resolution?
That resolution is still fewer pixels than a simple 4k display, which modern games seem to drive at 60fps quite regularly if you buy beefy hardware. A graphical gore fest like Doom runs at over 100fps on 4k on the card the author has, so a mostly static city builder should also operate fine at a resolution like that.
It's more for race/flight sim type stuff IMO but if you got it, why not play everything at that res provided it performs well.
Look at images of it from the top, that'll help you understand how immersive it is.