From 9To5Mac:
The point is that for most people, a MacBook Air is about web browsing and light work and such. The base model MacBook Air is powerful enough that — as surprising as this may sound — the extra $200 to upgrade to 16GB of RAM is probably not worth it for most.
This is the one I bought. I considered that it could be just like the iPhone - stupid good with minimal amounts of RAM.
I’m happy to see this playing out as true, both in my own testing and it others’ experience. One less thing I have to return and swap out for something else.