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Agreed. It's one of those "we'll figure this out later" things from the late 90's without any real programmatic constraints that led to a mishmash of pointless and unexpected behavior.

I personally can't come up with a good reason not to just remove the green ball entirely.

So the issue is iTunes, not the green button? And admittedly itunes behaviour is very well known, it's hardly surprising.

I completely agree with you. Don’t be so aggressive, be nice!

Apple should remove the zoom button. It’s not necessary, more confusing than anything.