I wonder if the Apple App Store has a memory leak, because it's using 1.72 GB in your screenshot. In my case it's PowerPoint 2016 - horrible memory leak.This happened to me shortly after purchasing this MacBook Air. High memory compression on just 8GB of RAM.
Then I understood that newer models tend to use more memory than older models, like my 2010 MBP.
As you can see, apps opened on that moment were merely Safari, Spotify, Pixelmator and iTunes... Yes, quite a lot tabs on the browser, but nothing exaggerated, I guess 20-25 tabs.
My recommendation for everyone remains the same: If you can afford those extra 250$, go for the 16GB of RAM.