Why doesn't the background resolution change as you change resolutions?

[WHS]

For long time it has become apparent to me that as I change my resolution for FFXIV from 1080p to 2k even 4k that the foreground is the only thing changing. The text and the overlay basically. Sure the background gets prettier but the scale never changes. Here are some photos to prove it.

@2K

@4K


According to this monitor: ASUS ROG PG278Q I should see 77% more screen every 2k resolution I go up. But I do not.
http://www.newegg.com/Product/Produc...-405-_-Product



So it seems that the only things that scale are text and overlay. Am I wrong or is this how the game is right now? Are there games that work like this monitor I listed and actually show you more screen as you go up in resolution?