Are you noticing any kind of performance hit? If not it doesn’t matter and forget about it!
Most of the people commenting appear to have no idea how Unix memory management works. You are spot on. You should worry about it if it actually has a noticeable effect.
Looking at memory utilisation doesn’t tell you anything useful if your system is running normally.
I have the 8gb MBA, although in my case it’s simply down to cost. On the basis of future-proofing, I would not recommend 8gb to anyone, and find even with my relatively light-moderate workflow that my system is regularly utilising swap. While mine was only ever intended to be used as a secondary machine for when I’m not at home, I have since switched to using it as my main machine as I’ve had some hardware issues with my main build. Either way, go for the 16 at minimum.
Yeah, can’t multitask a lot with only 8 GB. Keep your tabs to a minimum.
You only have 8GB of RAM, it’s going to use SWAP. The OS alone uses up 6GB or so of RAM just to get to your desktop.
Unified memory
How long its been since you last restarted?