How does scaling up negate anything? The purpose of higher resolution isn't "to get more stuff on the screen".
Even scaled, you still get the benefit of the higher resolution screen.
Getting more stuff on the screen is the only reason I would get a higher res monitor. My current monitor is 1080, too wide for one window and too narrow for two. I have used a 1440 and it is perfect for two windows side by side. I stuck with 1080 because the main purpose of my PC is gaming, 1440 would require a more expensive graphics card in addition to a more expensive monitor. Other people have different uses though, so having options is a good thing I guess.