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A 'US-Made iPhone' Is Pure Fantasy
(www.404media.co)
This is a most excellent place for technology news and articles.
My Linux system uses about 1 GB idle and yet I'm glad to have 16 GB - not because I wouldn't mostly be fine with 8, but because it just keeps more doors open. Can run more demanding programs, more programs simultaneously, can host something in the background, ...
The OS itself is more efficient than Windows, yes. But that's not a hard task, and it's less efficient than many Linux distros. No matter how efficient you are, 8 GB non-expandable RAM is not enough nowadays.